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Hot Shots I am learning to work out percentages of amounts. % Percentages are out of

Tim got 18 out of 25 in a test and Scott got 45 out of 50 in a test. Who got the best result ? We need to change the tests into percentages so that we can compare them. Let’s start by changing Tim’s score (18 out of 25) into a percentage X 4 72 Multiplying the numerator and denominator by 4 will give us an equivalent fraction out of %

Now we need to turn Scott’s score (45 out of 50 into a percentage) X 2 90 Multiplying the numerator and denominator by 2 will give us an equivalent fraction out of % Tim scored 72% and Scott scored 90%. It is now easy to see that Scott got the best result.

Room 13 completed a maths test out of 40. Help the teacher convert some student scores into percentages. 0% 25% 50% 100%75% 40 0 If the test is out of 40. What would 50% be? 20 What would 25% be?Tip: 25% is half of a half What would 75% be?Tip: a half plus one quarter. The number line above is called a double number line. You can see it is very helpful to imagine when converting scores into percentages.

Room 9 completed a science quiz which was out of 16. Help the teacher convert some student scores into percentages. 0% 25% 50% 100%75% 16 0 If the test is out of 16. What would 50% be? 8 What would 25% be?Tip: 25% is half of a half What would 75% be?Tip: a half plus one quarter. What would a score of 2 out of 16 be as a percentage? 2 You can see that 2 is exactly halfway between 0 and 25%. Half of 25% is 12.5%. 12.5%

Now try these questions on your own. 1) 2) 3) 4) 5) Click again when you have worked out all your answers. Need some more practise? Try pg34 & 35 of Teacher Tools Fractions, Decimals and Percentages Book Numeracy resourcesNumeracy resources 6) 7) 8) 9) 10) 25% 50% 25% 20% 33% 20% 48% 150% 75% Change these fractions into percentages