1. Saturday, 16 September 2006 ©RSH Number Ratio

2. Saturday, 16 September 2006 ©RSH Ratio The word ratio is used to describe a fraction. If the ratio of Sara’s pocket money to John’s pocket money is 1:2 then Sara gets half (1/2) as much as John or John gets twice (2 times) as much as Sara. Ratio The word ratio is used to describe a fraction. If the ratio of Sara’s pocket money to John’s pocket money is 1:2 then Sara gets half (1/2) as much as John or John gets twice (2 times) as much as Sara. Notes

3. Saturday, 16 September 2006 ©RSH Ratios can be simplified just like fractions. The ratio 2 : 4 is the same as 1 : 2 6 : 18 = 1 :3 Ratios can be simplified just like fractions. The ratio 2 : 4 is the same as 1 : 2 6 : 18 = 1 :3 Notes

4. Saturday, 16 September 2006 ©RSH Exercise 1.Express each ratio in its simplest form. a)1 : 4 b)3 : 4 c)5 : 2 d)3 : 4 a)4 : 16 b)9 : 12 c)30 : 12 d)18 : 24

5. Saturday, 16 September 2006 ©RSH Share £60 between Paul and Rob in the ratio 5 : 7 Example Answer There are 12 equal parts (5 + 7). Divide £60 by 12 to get value of each part. £60  12 = £5 Paul gets 5 x £5 = £25 Rob gets 7 x £5 = £35 Answer There are 12 equal parts (5 + 7). Divide £60 by 12 to get value of each part. £60  12 = £5 Paul gets 5 x £5 = £25 Rob gets 7 x £5 = £35

6. Saturday, 16 September 2006 ©RSH Exercise 1.Harry and Jane share a £200 prize in the ratio 4 : 6. How much does each get ? 10 equal parts. £200  10 = £20. Harry gets 4 x £20 = £80; Jane gets 6 x £20 = £120 2.Sam, Sue and Sally share a £2700 prize in the ratio 2 : 3 : 4. How much does each get ? 9 equal parts. £2700  9 = £300. Sam gets 2 x £300 = £600 Sue gets 3 x £300 = £900 Sally gets 4 x £300 = £1200