Solve 42,1*7/10-2,1*7/10

$$42,1 \cdot \frac { 7 } { 10 } - 2,1 \cdot \frac { 7 } { 10 }$$

Evaluate

$$28$$

Solution Steps

Convert decimal number 42,1 to fraction \frac{421}{10}.

$$\frac{421}{10}\times \frac{7}{10}-2,1\times \frac{7}{10}$$

Multiply \frac{421}{10} times \frac{7}{10} by multiplying numerator times numerator and denominator times denominator.

$$\frac{421\times 7}{10\times 10}-2,1\times \frac{7}{10}$$

Do the multiplications in the fraction \frac{421\times 7}{10\times 10}.

$$\frac{2947}{100}-2,1\times \frac{7}{10}$$

Convert decimal number 2,1 to fraction \frac{21}{10}.

$$\frac{2947}{100}-\frac{21}{10}\times \frac{7}{10}$$

Multiply \frac{21}{10} times \frac{7}{10} by multiplying numerator times numerator and denominator times denominator.

$$\frac{2947}{100}-\frac{21\times 7}{10\times 10}$$

Do the multiplications in the fraction \frac{21\times 7}{10\times 10}.

$$\frac{2947}{100}-\frac{147}{100}$$

Since \frac{2947}{100} and \frac{147}{100} have the same denominator, subtract them by subtracting their numerators.

$$\frac{2947-147}{100}$$

Subtract 147 from 2947 to get 2800.

$$\frac{2800}{100}$$

Divide 2800 by 100 to get 28.

$$28$$

Factor

$$7\times 2^{2}$$