Visit www.mentalstarters.co.uk For an ideal collection of Commercial Powerpoint Mental Starter Resources.

1. Visit www.mentalstarters.co.uk For an ideal collection of Commercial Powerpoint Mental Starter Resources. Used in schools throughout the country, these resources are a bright and colourful way to start your lesson.

2. Ratio © B. Taylor - 2004

3. Ratio Ratios compare quantities They are usually written in their simplest form. 2 is the biggest number which goes into both of these numbers eg: Simplify the ratio 4 : 10 answer: Divide each number in the ratio by 2, to give: 2 : 5

4. Ratio Ratios compare quantities They are usually written in their simplest form. 5 is the biggest number which goes into both of these numbers eg: Simplify the ratio 10 : 25 answer: Divide each number in the ratio by 5, to give: 2 : 5

5. Ratio Ratios compare quantities They are usually written in their simplest form. 3 is the biggest number which goes into both of these numbers eg: Simplify the ratio 15 : 21 answer: Divide each number in the ratio by 3, to give: 5 : 7

6. Ratio Ratios compare quantities They are usually written in their simplest form. 2 is the biggest number which goes into both of these numbers eg: Simplify the ratio 8 : 18 answer: Divide each number in the ratio by 2, to give: 4 : 9

7. Ratio Ratios compare quantities They are usually written in their simplest form. 7 is the biggest number which goes into both of these numbers eg: Simplify the ratio 35 : 56 answer: Divide each number in the ratio by 7, to give: 5 : 8

8. Ratio To make comparisons, we can write ratios in the form 1 : n. We divide both numbers in the ratio by the first number eg: Write the ratio 4 : 10 in the form 1 : n answer: Divide each number in the ratio by 4, to give: 1 : 2.5

9. Ratio To make comparisons, we can write ratios in the form 1 : n. We divide both numbers in the ratio by the first number eg: Write the ratio 3 : 21 in the form 1 : n answer: Divide each number in the ratio by 3, to give: 1 : 7

10. Ratio To make comparisons, we can write ratios in the form 1 : n. We divide both numbers in the ratio by the first number eg: Write the ratio 8 : 34 in the form 1 : n answer: Divide each number in the ratio by 8, to give: 1 : 4.25

11. Ratio To make comparisons, we can also write ratios in the form n : 1. We divide both numbers in the ratio by the second number eg: Write the ratio 4 : 10 in the form n : 1 answer: Divide each number in the ratio by 10, to give: 0.4 : 1

12. Ratio To make comparisons, we can also write ratios in the form n : 1. We divide both numbers in the ratio by the second number eg: Write the ratio 8 : 32 in the form n : 1 answer: Divide each number in the ratio by 32, to give: 0.25 : 1