RATIO AND PROPORTION

What is ratio? Ratio is a way of comparing amounts of something. It shows how much bigger one thing is than another. Ratio is a way of comparing amounts of something. It shows how much bigger one thing is than another. 1 nursery nurse for every 3 children 1 nursery nurse for every 3 children We would write this as 1:3 We would write this as 1:3

1 nursery nurse for every 3 children Ratio = 1:3 If another 3 children joined the nursery, we would need another 1 nursery nurse If another 3 children joined the nursery, we would need another 1 nursery nurse We would now have 2 nursery nurses and 6 children. We could write this as 2:6 We would now have 2 nursery nurses and 6 children. We could write this as 2:6 By cancelling the numbers down (dividing both numbers by 2) we end up with the original ratio of 1:3 By cancelling the numbers down (dividing both numbers by 2) we end up with the original ratio of 1:3

Q. In a nursery we need a ratio of 1 nursery nurse for every 3 children. How many nursery nurses do we need for 15 children? Step 1- Write down the ratio 1 : 3 Step 2- Label the numbers Nurses Children 1 : 3 1 : 3

Q. In a nursery we need a ratio of 1 nursery nurse for every 3 children. How many nursery nurses do we need for 15 children? Step 3- Put the 3 rd number Nurses Children in the correct column 1 : 3 in the correct column 1 : Step 4- Divide the 2 numbers which are in the same 15 ÷ 3 = 5 which are in the same 15 ÷ 3 = 5 column column Step 5- Multiply the answer by the number in the other 5 X 1 = 5 the number in the other 5 X 1 = 5 column column ANS = 5 nursery nurses

Q. A nursery uses 3 pints of milk for 7 bowls of cereal. How many bowls of cereal will they get from 12 pints of milk? Step 1- Step 1- 3 : 7 3 : 7 Step 2 -Step 2 - Milk Cereal 3 : 7 Step 3 -Step Step 4 -Step ÷ 3 = 4 12 ÷ 3 = 4 Step 5 -Step X 7 = 28 bowls of cereal

Q. A nursery uses 3 pints of milk for 7 bowls of cereal How many bowls of cereal will you get from: How many bowls of cereal will you get from: 1) 6 pints of milk 2) 18 pints of milk 3) 33 pints of milk 4) 90 pints of milk

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