Solve 12.3-17.3+5.9-9.2+18.9-24.9+14.5-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6

$$12.3-17.3+5.9-9.2+18.9-24.9+14.5-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Evaluate

$$29.9$$

Solution Steps

Subtract 17.3 from 12.3 to get -5.

$$-5+5.9-9.2+18.9-24.9+14.5-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -5 and 5.9 to get 0.9.

$$0.9-9.2+18.9-24.9+14.5-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 9.2 from 0.9 to get -8.3.

$$-8.3+18.9-24.9+14.5-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -8.3 and 18.9 to get 10.6.

$$10.6-24.9+14.5-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 24.9 from 10.6 to get -14.3.

$$-14.3+14.5-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -14.3 and 14.5 to get 0.2.

$$0.2-18.3+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 18.3 from 0.2 to get -18.1.

$$-18.1+22.7-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -18.1 and 22.7 to get 4.6.

$$4.6-5.9+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 5.9 from 4.6 to get -1.3.

$$-1.3+10.3-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -1.3 and 10.3 to get 9.

$$9-23.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 23.1 from 9 to get -14.1.

$$-14.1+16.8-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -14.1 and 16.8 to get 2.7.

$$2.7-4.7+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 4.7 from 2.7 to get -2.

$$-2+3.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -2 and 3.9 to get 1.9.

$$1.9-12.6+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 12.6 from 1.9 to get -10.7.

$$-10.7+21.5-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -10.7 and 21.5 to get 10.8.

$$10.8-26.8+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 26.8 from 10.8 to get -16.

$$-16+13.2-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -16 and 13.2 to get -2.8.

$$-2.8-2.7+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 2.7 from -2.8 to get -5.5.

$$-5.5+18.3-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -5.5 and 18.3 to get 12.8.

$$12.8-7.7+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 7.7 from 12.8 to get 5.1.

$$5.1+19.2-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add 5.1 and 19.2 to get 24.3.

$$24.3-11.6+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 11.6 from 24.3 to get 12.7.

$$12.7+2.9-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add 12.7 and 2.9 to get 15.6.

$$15.6-15.9+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 15.9 from 15.6 to get -0.3.

$$-0.3+7.3-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -0.3 and 7.3 to get 7.

$$7-24.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 24.1 from 7 to get -17.1.

$$-17.1+19.6-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -17.1 and 19.6 to get 2.5.

$$2.5-15.5+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 15.5 from 2.5 to get -13.

$$-13+17.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -13 and 17.2 to get 4.2.

$$4.2-14.2+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 14.2 from 4.2 to get -10.

$$-10+19.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -10 and 19.4 to get 9.4.

$$9.4-18.7+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 18.7 from 9.4 to get -9.3.

$$-9.3+4.7-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -9.3 and 4.7 to get -4.6.

$$-4.6-11.6+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 11.6 from -4.6 to get -16.2.

$$-16.2+14.8-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -16.2 and 14.8 to get -1.4.

$$-1.4-23.2+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 23.2 from -1.4 to get -24.6.

$$-24.6+21.9-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -24.6 and 21.9 to get -2.7.

$$-2.7-14.1+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 14.1 from -2.7 to get -16.8.

$$-16.8+19.2-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -16.8 and 19.2 to get 2.4.

$$2.4-9.8+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 9.8 from 2.4 to get -7.4.

$$-7.4+6.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -7.4 and 6.7 to get -0.7.

$$-0.7-1.9+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 1.9 from -0.7 to get -2.6.

$$-2.6+13.5-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -2.6 and 13.5 to get 10.9.

$$10.9-19.3+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 19.3 from 10.9 to get -8.4.

$$-8.4+5.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -8.4 and 5.2 to get -3.2.

$$-3.2-9.1+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 9.1 from -3.2 to get -12.3.

$$-12.3+25.1-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -12.3 and 25.1 to get 12.8.

$$12.8-21.6+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 21.6 from 12.8 to get -8.8.

$$-8.8+13.7-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -8.8 and 13.7 to get 4.9.

$$4.9-8.3+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 8.3 from 4.9 to get -3.4.

$$-3.4+3.9-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -3.4 and 3.9 to get 0.5.

$$0.5-16.8+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 16.8 from 0.5 to get -16.3.

$$-16.3+12.1-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -16.3 and 12.1 to get -4.2.

$$-4.2-7.4+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 7.4 from -4.2 to get -11.6.

$$-11.6+23.7-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -11.6 and 23.7 to get 12.1.

$$12.1-12.1+17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 12.1 from 12.1 to get 0.

$$17.3-12.8+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 12.8 from 17.3 to get 4.5.

$$4.5+19.1-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add 4.5 and 19.1 to get 23.6.

$$23.6-24.6+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 24.6 from 23.6 to get -1.

$$-1+26.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Add -1 and 26.7 to get 25.7.

$$25.7-16.8+13.9-5.9+9.7-12.3+15.6$$

Subtract 16.8 from 25.7 to get 8.9.

$$8.9+13.9-5.9+9.7-12.3+15.6$$

Add 8.9 and 13.9 to get 22.8.

$$22.8-5.9+9.7-12.3+15.6$$

Subtract 5.9 from 22.8 to get 16.9.

$$16.9+9.7-12.3+15.6$$

Add 16.9 and 9.7 to get 26.6.

$$26.6-12.3+15.6$$

Subtract 12.3 from 26.6 to get 14.3.

$$14.3+15.6$$

Add 14.3 and 15.6 to get 29.9.

$$29.9$$

Factor

$$\frac{13 \cdot 23}{2 \cdot 5} = 29\frac{9}{10} = 29.9$$