04032021 Ratio MATHSWATCH CLIP 38 106 107 GRADE

04/03/2021 Ratio MATHSWATCH CLIP 38, 106, 107 GRADE 2, 3 L. O. To be able to § Simplify a ratio and identify equivalent ratios § Share amounts in a given ratio Key Words divide, share, proportion, simplify, equivalent, quantity, parts Starter:

04/03/2021 Ratio MATHSWATCH CLIP 38, 106, 107 GRADE 2, 3 EQUIVALENT RATIOS

MATHSWATCH CLIP 38, 106, 107 GRADE 2, 3 Ratio 04/03/2021 To find the missing number in the ratio we have to work out what we have multiplied 5 by to get 7. 5: … so the 3 must be multiplied by 1. 5. × 1. 5 3: 5 4. 5? : 7. 5 × 1. 5 The 5 is multiplied by 1. 5 … To do this divide 7. 5 by 5. 7. 5 ÷ 5 = 1. 5 So when the width of the rectangle is 7. 5 cm this height is 4. 5 cm.

MATHSWATCH CLIP 38, 106, 107 GRADE 2, 3 Ratio 04/03/2021 The ratio of boys to girls in year 10 of a particular school is 6 : 7. If there are 72 boys, how many girls are there? Again we can work this out by finding the missing number in the ratio. The 6 is multiplied by 12 … × 12 6: 7 72 : ? 84 To do this divide 72 by 6. 72 ÷ 6 = 12 If there are 72 boys there must be 84 girls. × 12 … so the 7 must be multiplied by 12.

04/03/2021 Ratio MATHSWATCH CLIP 38, 106, 107 GRADE 2, 3

04/03/2021 Ratio MATHSWATCH CLIP 38, 106, 107 GRADE 2, 3 Girls : Boys in a group… Butter(g): Flour(g): Milk(ml) • 1: 2, but 7 girls… • 2: 3: 1, but 45 g flour… • 3: 2, but 20 boys… • 3: 1: 6, but 12 ml milk… • 2: 5, but 25 boys… • 4: 1: 3, but 20 g butter… • 7: 3, but 28 girls… • 3: 1: 2, but 200 ml of milk… • 4: 5, but 32 girls… • 5: 2: 8, but 200 g flour…