Solve 31/4*12/5

$$3 \frac { 1 } { 4 } \times 1 \frac { 2 } { 5 }$$

Evaluate

$$\frac{91}{20}=4.55$$

Solution Steps

Multiply 3 and 4 to get 12.

$$\frac{12+1}{4}\times \frac{1\times 5+2}{5}$$

Add 12 and 1 to get 13.

$$\frac{13}{4}\times \frac{1\times 5+2}{5}$$

Multiply 1 and 5 to get 5.

$$\frac{13}{4}\times \frac{5+2}{5}$$

Add 5 and 2 to get 7.

$$\frac{13}{4}\times \frac{7}{5}$$

Multiply \frac{13}{4} times \frac{7}{5} by multiplying numerator times numerator and denominator times denominator.

$$\frac{13\times 7}{4\times 5}$$

Do the multiplications in the fraction \frac{13\times 7}{4\times 5}.

$$\frac{91}{20}$$

Factor

$$\frac{7 \cdot 13}{2 ^ {2} \cdot 5} = 4\frac{11}{20} = 4.55$$