Solve (1-0,7)*0,2+1,8:2-1=

$$( 1 - 0,7 ) \cdot 0,2 + 1,8 : 2 - 1 =$$

Evaluate

$$-0,04$$

Solution Steps

Subtract 0,7 from 1 to get 0,3.

$$0,3\times 0,2+\frac{1,8}{2}-1$$

Multiply 0,3 and 0,2 to get 0,06.

$$0,06+\frac{1,8}{2}-1$$

Expand \frac{1,8}{2} by multiplying both numerator and the denominator by 10.

$$0,06+\frac{18}{20}-1$$

Reduce the fraction \frac{18}{20} to lowest terms by extracting and canceling out 2.

$$0,06+\frac{9}{10}-1$$

Convert decimal number 0,06 to fraction \frac{6}{100}. Reduce the fraction \frac{6}{100} to lowest terms by extracting and canceling out 2.

$$\frac{3}{50}+\frac{9}{10}-1$$

Least common multiple of 50 and 10 is 50. Convert \frac{3}{50} and \frac{9}{10} to fractions with denominator 50.

$$\frac{3}{50}+\frac{45}{50}-1$$

Since \frac{3}{50} and \frac{45}{50} have the same denominator, add them by adding their numerators.

$$\frac{3+45}{50}-1$$

Add 3 and 45 to get 48.

$$\frac{48}{50}-1$$

Reduce the fraction \frac{48}{50} to lowest terms by extracting and canceling out 2.

$$\frac{24}{25}-1$$

Convert 1 to fraction \frac{25}{25}.

$$\frac{24}{25}-\frac{25}{25}$$

Since \frac{24}{25} and \frac{25}{25} have the same denominator, subtract them by subtracting their numerators.

$$\frac{24-25}{25}$$

Subtract 25 from 24 to get -1.

$$-\frac{1}{25}$$

Factor

$$-0,04$$