Question

If a persons hair grows about 1.2 centimeters a month about how much would it grow in 9 months

Answer 1

`\sf 9*1,2=9* (12)/(10)= (108)/(10)=\boxed{\sf 10,8~centimeters}`

Answer 2

10.8 centimeters

EASY WAY: 1.2 x 9 = 10.8
LONG WAY:
1.2 in one month
2.4 in two
3.6 in three
4.8 in four
6.0 in five
7.2 in six
8.4 in seven
9.6 in eight
10.8 in nine!!