Ratio LO TBAT share amounts using a ratio

Ratio LO: TBAT share amounts using a ratio. By the end of the lesson: Be able to calculate how much one share of an amount is worth given a ratio. Be able to calculate how much one person would get of an amount using a ratio. Be able to calculate how much everybody gets of an amount using a ratio.

Starter Core Challenge 7 x 4 14 x 6 8 x 6 21 x 11 15 x 9 536 x 27 28 ÷ 4 84 ÷ 12 48 ÷ 8 231 ÷ 7 135 ÷ 9 153. 63 ÷ 3

Starter Core Challenge 7 x 4 = 28 14 x 6 = 84 8 x 6 = 48 21 x 11 = 231 15 x 9 = 135 536 x 27 = 14472 28 ÷ 4 = 7 84 ÷ 12 = 7 48 ÷ 8 = 6 231 ÷ 7 = 33 135 ÷ 9 = 15 153. 63 ÷ 3 = 51. 21

Sharing A packet contains 10 sweets. What different ways could you share the sweets among…. . CORE - 2 people? CHALLENGE - 3 people? SUPER CHALLENGE - 4 people?

What is a Ratio? A ratio can be thought of as an unfair sharing or unequal sharing of an amount.

An example of a Ratio? Imagine you had a bag of 10 sweets.

An example of a Ratio? You only like the lemon flavoured sweets. So you give your friend the blackcurrant flavoured sweets.

What is a Ratio? This is an example of a ratio. You have unfairly shared your sweets. You have had 7 sweets, while your friend has had 3 sweets. We can write this in maths as a ratio.

The Ratio 7: 3

How the method works Share 25 sweets into a ratio of 2: 3 =25 =5 1) 2) 3) 2+3=5 25 ÷ 5 = 5 2 x 5 = 10 3 x 5 = 15

How the method works Share 45 sweets into a ratio of 5: 4 =45 =5 1) 2) 3) 5+4=9 45 ÷ 9 = 5 5 x 5 = 25 4 x 5 = 20

How the method works Share 36 sweets into a ratio of 1: 5 =36 =6 1) 2) 3) 1+5=6 36 ÷ 6 = 6 1 x 6=6 5 x 6 = 30

How the method works Share 20 sweets into a ratio of 1: 3 =20 =5 1) 2) 3) 1+3=4 20 ÷ 4 = 5 1 x 5=5 3 x 5 = 15

How the method works Share 72 sweets into a ratio of 5: 3 =72 =9 1) 2) 3) 5+3=8 72 ÷ 8 = 9 5 x 9 = 45 3 x 9 = 27

How the method works Share 48 sweets into a ratio of 3: 1 =48 =12 1) 3 + 1 = 4 2) 48 ÷ 4 = 12 3) 3 x 12 = 36 1 x 12 = 12

Just with numbers……. The Method Share 10 sweets in a ratio of 7: 3 1) Add up the ratios. 7 + 3 = 10 2) Find one share. We divide our amount by the last answer. 10 ÷ 10 = 1 3) Multiply our ratios by this answer. 7 x 1=7 3 x 1=3

Example Share 20 sweets into a ratio of 3: 2 1) Add up the ratios. 3 + 2 = 5 2) Find one share. We divide our amount by the last answer. 20 ÷ 5 = 4 3) Multiply our ratios by this answer. 3 x 4 = 12 2 x 4=8

Your go…… Share 30 sweets into a ratio of 4: 1 1) Add up the ratios. 4 + 1 = 5 2) Find one share. We divide our amount by the last answer. 30 ÷ 5 = 6 3) Multiply our ratios by this answer. 4 x 6 = 24 1 x 6=6

Your go…… Share 45 sweets into a ratio of 5: 4 1) Add up the ratios. 5 + 4 = 9 2) Find one share. We divide our amount by the last answer. 45 ÷ 9 = 5 3) Multiply our ratios by this answer. 5 x 5 = 25 4 x 5 = 20

Your go…… Share 24 sweets into a ratio of 2: 1 1) Add up the ratios. 2 + 1 = 3 2) Find one share. We divide our amount by the last answer. 24 ÷ 3 = 8 3) Multiply our ratios by this answer. 2 x 8 = 16 1 x 8=8

Questions Bronze Share 24 into the following ratios: Silver Share £ 36 into the following ratios: Gold Share 48 cm into the following ratios: a) 2: 1 4: 2 b) 3: 1 3: 5 c) 5: 1 1: 5 1: 7 d) 2: 4 7: 5 1: 5: 6

Answers Bronze Share 24 into the following ratios Silver Gold Share £ 36 into the following ratios Share 48 cm into the following ratios 16: 8 £ 24: £ 12 32 cm: 16 cm 18: 6 £ 27: £ 9 18 cm: 30 cm 20: 4 £ 6: £ 30 6 cm: 42 cm 8: 16 £ 21: £ 15 4 cm: 20 cm: 24 cm

RATIO Which of these can you now do? All: will be able to calculate how much one share of an amount is worth given a ratio. Most: will be able to calculate how much one person would get of an amount using a ratio. Some: will be able to calculate how much everybody gets of an amount using a ratio.

SPOT THE MISTAKE Share 48 sweets into a ratio of 4: 2 Step 1) 4 x 2 = 8 Step 2) 48 ÷ 8 = 6 Step 3) 4 x 6 = 24 2 x 6 = 12

SPOT THE MISTAKE Share 36 sweets into a ratio of 4: 2 Step 1) 4 + 2 = 6 Step 2) 36 ÷ 6 = 6 Step 3) 4 x 6 = 24 24 x 6 = 144

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Ratio LO: TBAT break down more complex ratio questions. Starter Calculate 27 x 3 273 x 34 72 ÷ 4 436 ÷ 4 23 23 + 32 8– 2 x 3 (2 + 3)2 + 7 x 2

Ratio LO: TBAT break down more complex ratio questions. Answers 27 x 3 = 81 273 x 34 = 9282 72 ÷ 4 = 18 436 ÷ 4 = 109 23 = 2 x 2 = 8 23 + 32 = 17 8– 2 x 3=2 (2 + 3)2 + 7 x 2 = 39

How the method works Share 36 sweets into a ratio of 1: 5 1) 1 + 5 = 6 2) 36 ÷ 6 = 6 3) 1 x 6 = 6 5 x 6 = 30 =36 =6

How the method worked Share 45 sweets into a ratio of 5: 4 1) 5 + 4 = 9 2) 45 ÷ 9 = 5 3) 5 x 5 = 25 4 x 5 = 20 =45 =5

Slightly harder question Alison and Henry shared some sweets in a ratio of 3: 5. Henry got 15 sweets as a result. How many sweets were there to begin with? =24 =15 =3

Example Two people shared some money in a ratio of 4: 7. The first person got £ 16 as a result. How much money did they share? =11 x £ 4 = £ 44 =£ 16 =£ 4

Question Two people shared some money in a ratio of 3: 5. The first person got £ 24. How much did they share in total? =8 x £ 8 = £ 64 =£ 24 =£ 8

Question Two people shared some money in a ratio of 7: 5. The second person got £ 25 as a result. How much money did they share? =12 x £ 5 = £ 60 =£ 25 =£ 5

Question Three people shared some money in a ratio of 4: 3: 5. The second person got £ 21 as a result. How much money did they share? =12 x £ 7 = £ 84 =£ 21 =£ 7

Questions Bronze Bill and Jane share some money in the ratio of 3: 4, Bill gets £ 21, how much does Jane get? Silver Noah, Ben and Jen share some Easter eggs in the ratio 2: 5: 7, Ben gets 60, how many do Noah and Jen get? Gold Kyle, Geri & Mo buy a bag of sweets. The bag contains 60 sweets. Geri gets double Kyle’s amount. Mo gets the same as Geri. How many sweets do they get each?

Bronze Bill and Jane share some money in the ratio of 3: 4. Bill gets £ 21, how much does Jane get? =£ 21 =£ 7 = 4 x £ 7 = £ 28

Silver Noah, Ben and Jen share some Easter eggs in the ratio 2: 5: 7, Ben gets 60, how many do Noah and Jen get? =£ 60 = £ 60 ÷ 5 = £ 12 = 2 x £ 12 = £ 24 = 7 x £ 12 = £ 84

Gold Kyle, Geri & Mo buy a bag of sweets. The bag contains 60 sweets. Geri gets double Kyle’s amount. Mo gets the same as Geri. How many sweets do they get each? =60 Kyle Jerri = 60 ÷ 5 Mo = 12 Jerri Mo Geri gets = 2 x 12 = 24 Mo gets = 2 x 12 = 24

Questions Bronze Benny and Carl share some money in the ratio of 3: 5, Benny gets £ 36, how much does Carl get? Silver Nigel, Frankie and Sara share some chocolate buttons in the ratio 3: 5: 1, Frankie gets 75, how many do Nigel and Sara get? Gold Hal, Ori & Perri buy a bag of sweets. The bag contains 68 sweets. Perri gets double Ori’s amount. Hal gets half as much as Perri. How many sweets do they get each?

Bronze Benny and Carl share some money in the ratio of 3: 5, Benny gets £ 36, how much does Carl get? =£ 36÷ 3 =£ 12 = 4 x £ 12 = £ 48

Silver Nigel, Frankie and Sara share some chocolate buttons in the ratio 3: 5: 1, Frankie gets 75, how many do Nigel and Sara get? =£ 75 = 4 x £ 15 = £ 60 = £ 75 ÷ 5 =£ 15

Gold Hal, Ori & Perri buy a bag of sweets. The bag contains 68 sweets. Perri gets double Ori’s amount. Hal gets half as much as Perri. How many sweets do they get each? =68 Ori Perri = 68 ÷ 4 Hal = 17 Perri gets = 2 x 17 = 34 Hal gets = 1 x 17 = 17

• Now rate yourself for this lesson/topic using the following code: • U – Little (unsatisfactory) effort! • S – Some effort, still room for improvement!! • E – Excellent effort!!! • • • Little understanding Some understanding, not completely sure Excellent understanding