Whakaoti i te 1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9

$$1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9$$

Aromātai

$$90$$

Ngā Upane Otinga

Tāpirihia te 1 ki te 1, ka 2.

$$2+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 2 ki te 2, ka 4.

$$4+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 4 ki te 2, ka 6.

$$6+3+3+4+4+5+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 6 ki te 3, ka 9.

$$9+3+4+4+5+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 9 ki te 3, ka 12.

$$12+4+4+5+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 12 ki te 4, ka 16.

$$16+4+5+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 16 ki te 4, ka 20.

$$20+5+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 20 ki te 5, ka 25.

$$25+5+6+6+7+7+8+8+9+9$$

Tāpirihia te 25 ki te 5, ka 30.

$$30+6+6+7+7+8+8+9+9$$

Tāpirihia te 30 ki te 6, ka 36.

$$36+6+7+7+8+8+9+9$$

Tāpirihia te 36 ki te 6, ka 42.

$$42+7+7+8+8+9+9$$

Tāpirihia te 42 ki te 7, ka 49.

$$49+7+8+8+9+9$$

Tāpirihia te 49 ki te 7, ka 56.

$$56+8+8+9+9$$

Tāpirihia te 56 ki te 8, ka 64.

$$64+8+9+9$$

Tāpirihia te 64 ki te 8, ka 72.

$$72+9+9$$

Tāpirihia te 72 ki te 9, ka 81.

$$81+9$$

Tāpirihia te 81 ki te 9, ka 90.

$$90$$

Tauwehe

$$2\times 3^{2}\times 5$$