Solve 21/5*31/4

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

Evaluate

$$\frac{143}{20}=7.15$$

Solution Steps

Multiply 2 and 5 to get 10.

$$\frac{10+1}{5}\times \frac{3\times 4+1}{4}$$

Add 10 and 1 to get 11.

$$\frac{11}{5}\times \frac{3\times 4+1}{4}$$

Multiply 3 and 4 to get 12.

$$\frac{11}{5}\times \frac{12+1}{4}$$

Add 12 and 1 to get 13.

$$\frac{11}{5}\times \frac{13}{4}$$

Multiply \frac{11}{5} times \frac{13}{4} by multiplying numerator times numerator and denominator times denominator.

$$\frac{11\times 13}{5\times 4}$$

Do the multiplications in the fraction \frac{11\times 13}{5\times 4}.

$$\frac{143}{20}$$

Factor

$$\frac{11 \cdot 13}{2 ^ {2} \cdot 5} = 7\frac{3}{20} = 7.15$$