Multiplying & Dividing

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Presentation transcript:

Multiplying & Dividing goteachmaths.co.uk Multiplying & Dividing Fractions

Multiplying & Dividing 24 November 2018 Multiplying & Dividing Fractions

4 3 3 x 4 = 12

1 3 x 1 2 = 1 2 1 3 1 6

1 3 x 1 4 = 1 4 1 3 1 12

2 3 x 3 4 = 3 4 2 3 6 12

Model these calculations in your book: 1 3 x 1 4 = 2 3 x 2 5 = 1 5 x 1 4 = 3 5 x 6 7 = 1 6 x 3 4 = 3 7 x 4 9 =

1 3 1 3 1 9 (1x1) =1 =9 (3x3) To multiply fractions: Multiply the numerators. Multiply the denominators. (1x1) =1 1 3 1 3 1 9 EXAMPLE 1: =9 (3x3)

(1x2) =2 1 4 2 5 2 20 1 10 EXAMPLE 2: =20 (4x5)

(2x3) =6 2 5 3 7 6 35 EXAMPLE 3: =35 (5x7)

Level 1 Level 2 Extension 1 2 x 1 5 = 1 10 1 5 x 3 5 = 3 25 Multiply the fractions. Write the question AND answer. Level 1 Level 2 Extension 1 2 x 1 5 = 1 10 1 5 x 3 5 = 3 25 6 11 x 8 5 = 48 55 2 2 5 x 3 1 3 = 2 3 x 3 4 = 6 12 = 1 2 4 9 x 5 6 = 20 54 = 10 27 4 24 x 2 3 = 8 72 = 1 9 3 4 7 x 1 1 4 = 4 6 x 2 5 = 8 30 = 4 15 10 11 x 6 7 = 60 77 10 13 x 6 15 = 60 195 = 12 39 5 4 5 x 3 1 3 = 6 8 x 9 12 = 54 96 = 27 48 7 4 x 3 9 = 21 36 = 7 12 24 25 x 4 5 = 96 125 1 11 x 8 5 = 8 55 8 25 x 3 4 = 24 100 = 6 25 18 36 x 4 5 = 72 180 = 2 5

How many eighths go into one quarter? Division 24 ÷ 4 = 12 How many 4s go into 24? 6 1 4 ÷ 1 8 = How many eighths go into one quarter?

2 1 4 ÷ 1 8 = How many eighths go into one quarter?

4 2 5 ÷ 1 10 = How many tenths go into two fifths? 1 5 1 5 1 10 1 10 1 10 1 10 4 tenths go into one fifth.

3/4 1 4 ÷ 1 3 = How many thirds go into a quarter? Only 3 4 of one third goes into a quarter.

4 5 ÷ 2 3 = 1 2 10 How many two-thirds go into four-fifths? 1 and a two-tenth two-thirds go into four-fifths.

Model these calculations in your book: 2 3 ÷ 1 6 = 2 3 ÷ 1 6 = 3 5 ÷ 1 10 = 1 3 ÷ 4 6 = 4 7 ÷ 1 14 = 7 8 ÷ 1 4 =

1 3 1 2 ? ? 1 1 2 1 2 3 1 3 2 To divide fractions: EXAMPLE 1 KEEP CHANGE FLIP 1 1 2 1 2 3 1 3 2

2 4 1 3 ? ? 2 3 1 3 4 2 4 6 To divide fractions: EXAMPLE 2 KEEP CHANGE FLIP 2 3 1 3 4 2 4 6

4 6 2 5 ? ? 3 5 2 5 6 4 12 20 To divide fractions: EXAMPLE 3 KEEP CHANGE FLIP 3 5 2 5 6 4 12 20

Write the question AND answer. Divide the fractions. Write the question AND answer. Level 1 Level 2 Extension 1 2 ÷ 2 5 = 5 4 2 7 ÷ 5 8 = 16 35 12 7 ÷ 3 14 = 168 21 1 3 ÷ 2 3 = 3 6 = 1 2 1 10 ÷ 7 9 = 9 70 3 10 ÷ 7 9 = 27 70 3 4 ÷ 3 5 = 15 12 5 12 ÷ 2 13 = 65 24 5 25 ÷ 3 11 = 55 75 = 11 25 5 6 ÷ 2 3 = 15 12 5 6 ÷ 2 15 = 75 12 16 34 ÷ 3 15 = 240 102 2 4 ÷ 3 9 = 18 12 3 13 ÷ 9 11 = 33 117 5 27 ÷ 18 3 = 15 486