Solve 12/5*21/4

$$1 \frac { 2 } { 5 } \times 2 \frac { 1 } { 4 }$$

Evaluate

$$\frac{63}{20}=3.15$$

Solution Steps

Multiply 1 and 5 to get 5.

$$\frac{5+2}{5}\times \frac{2\times 4+1}{4}$$

Add 5 and 2 to get 7.

$$\frac{7}{5}\times \frac{2\times 4+1}{4}$$

Multiply 2 and 4 to get 8.

$$\frac{7}{5}\times \frac{8+1}{4}$$

Add 8 and 1 to get 9.

$$\frac{7}{5}\times \frac{9}{4}$$

Multiply \frac{7}{5} times \frac{9}{4} by multiplying numerator times numerator and denominator times denominator.

$$\frac{7\times 9}{5\times 4}$$

Do the multiplications in the fraction \frac{7\times 9}{5\times 4}.

$$\frac{63}{20}$$

Factor

$$\frac{3 ^ {2} \cdot 7}{2 ^ {2} \cdot 5} = 3\frac{3}{20} = 3.15$$