# How do you simplify #(2/15)(25/49)(-63/72)#?

##### 2 Answers

#### Explanation:

#"note that "-63/72" can be simplified"#

#"by "color(blue)"cancelling "" numerator/denominator by 9"#

#rArr-63/72=-cancel(63)^7/cancel(72)^8=-7/8#

#"thus the calculation becomes"#

#2/15xx25/49xx-7/8#

#"simplify further by cancelling 2/8, 15/25 and 7/49"#

#cancel(2)^1/cancel(15)^3xxcancel(25)^5/cancel(49)^7xx-cancel(7)^1/cancel(8)^4#

#"multiply the remaining values on the "#

#"numerator/denominator"#

#=(1xx5xx-1)/(3xx7xx4)=-5/84#

#### Explanation:

Start by cancelling with any common factors in the numerators and denominators.

There are different ways of cancelling. The order is not important.

This is easier than multiplying all the tops together and all the bottoms together and then trying to simplify.