After arianna completed some work, she figured she still had 78 21/100 pictures to paint. if she completed another 34 23/25 pictures, how many pictures did arianna still have to paint Plz be a long answer

Subtract the number she completed from what she had left to paint originally.

The fractions have different denominators so first step is to rewrite the fractions with a common denominator.

23/25 can be rewritten as 92/100

Now you have 78 21/100 - 34 92/100

Because 21/100 is smaller than 92/100 subtract 1 whole number from 78 and rewrite 1 as 100/100 and add that to the fraction.

78 21/100 becomes 77 121/100

Now subtract :

77 121/100 - 34 92/100

77-34 = 43

And 121/100 - 92/100 = 29/100

Combine to get 43 and 29/100

78 21/100-34 23/25

7821-973

100 25

7821-3892

100 100

=3982

100

=39.82