solve and simplify 8/20 - 7/10

To solve and simplify the expression 8/20 - 7/10, we need to find a common denominator for the fractions. In this case, the common denominator is 20 because it is a multiple of 10 and it is the denominator with the larger value.

To convert 7/10 into an equivalent fraction with a denominator of 20, we multiply both the numerator and the denominator by 2: (7/10)(2/2) = 14/20.

Now we can subtract the fractions:

8/20 - 14/20 = (8 - 14)/20 = -6/20.

Therefore, 8/20 - 7/10 simplifies to -6/20.