Judy uses 10 pencils during her 5 day school week. A 30 pack of pencils costs $4. How much will she spend on pencils over 45 days?
She uses 2 pencils a day because 10 / 5 = <T>divide(10, 5)=2.0
She will use 90 pencils in 45 days because 2 x 45 = <T>multiply(2, 45)=90
She will need 3 packs of pencils because 90 / 30 = <T>divide(90, 30)=3.0
She will spend $12 because 3 x 4 = <T>multiply(3, 4)=12
