Question

A box has 70 cookies . 10% are broken (a) What fraction is broken ?

(b) What fraction remained whole?​

Answer 1

Explanation:

70(10/100)=7 broken cookies.

7/70=1/10 is the fraction broken

(70-7)/70=63/70 is the fraction remaining whole

Answer 2

(a) 1/7 are broken

(b) 6/7 remain whole

Explanation:

70 is a nice number to deal with in terms of percentages and fractions. If 10% of the cookies are broken, do 10/70. That fraction simplified gets you 1/7. To find the remaining whole cookies. Do 7/7 - 1/7 = 6/7 (or if you already know that in your head that works too)