Fractions Multiplication Division Multiplication Using a Calculator 1

Fractions Multiplication & Division

Multiplication Using a Calculator 1 x 1 2 2 1 = 4 1 x 1 2 3 1 = 6 1 x 1 2 5 1 = 10 What is happening?

It works like this Multiply Numerators 1 x 1 2 5 1 x 1 1 = = 2 x 5 10 Multiply Denominators

Multiplication 3 x 1 5 2 3 = 10 4 x 2 7 5 8 = 35 7 x 2 9 5 14 = 45 Is the same thing happening here?

Now try these 3 x 2 8 3 1 = 4 6 = 24 4 x 3 9 5 4 = 15 12 = 45 5 x 3 1 = 12 10 8 15 = 120 Because the CALCULATOR simplifies fractions automatically

Calculator is Cancelling down Find any number that is a factor of one numerator AND one denominator 3! 4 x 3 5 39 1 4 x 1 4 = = 3 x 5 15

And again…. Find any number that is a factor of one numerator AND one denominator Find another factor of both 3! 2! 1 4 3 x 2 8 13 1 1 x 1 1 = = 4 x 1 4

Division 1 ÷ 1 5 2 2 = 5 1 ÷ 1 7 3 3 = 7 1 ÷ 1 5 4 4 = 5 What is happening?

How it works? 1 ÷ 1 5 2 1 2 = x 5 1 1 x 2 2 = = 5 x 1 5 1 ÷ 1 7 3 1 3 = x 7 1 1 x 3 3 = = 7 x 1 7 1 ÷ 1 5 4 1 4 = x 5 1 1 x 4 4 = = 5 x 1 5

Division 2 ÷ 1 5 2 4 = 5 3 ÷ 4 7 5 15 = 28 4 ÷ 3 9 5 20 = 27 Is the same thing happening here?

Now try these 2 ÷ 2 5 3 3 = 5 3 ÷ 4 5 5 3 = 4 4 ÷ 2 9 3 2 = 3 Cancelling again!

Division & cancelling 1 2 ÷ 2 = 2 x 3 = 1 x 3 = 3 5 12 5 1 5 x 1 5 5 3 1 3 ÷ 4 3 x 5 3 x 1 3 = = 5 5 15 4 1 x 4 4 2 1 4 ÷ 2 = 4 x 3 = 2 x 1 = 2 3 1 3 x 1 9 3 3 9 12 3

Mixed numbers Try the questions without calculators first Remember how to enter a mixed number? SHIFT ab / c