Ratio What is ratio Ratio is used to

Ratio

What is ratio? Ratio is used to compare any two or three quantities.

Why do we learn ratio? Ratio is around us in our daily lives. For example: Shopping - $3. 00 per kg of rice $9. 00 for 3 kg of rice Photocopying – 2. 5 cents per copy 25 cents for 10 copies Factory(production) – 10 000 bottles per minute 20 000 bottles in 2 minutes Payment - $3. 00 per 45 minutes parking $6. 00 per 1. 5 hours parking

Finding ratio. 3 pears 4 cherries The ratio of the pear to cherry is 3 : 4

Find the ratio. 6 strawberries 2 pineapples 1. What is the ratio of the strawberries to the ratio of the pineapples? 2. What is the ratio of the pineapples to the ratio of the strawberries?

6 strawberries 2 pineapples How many ways can we regroup them?

Draw models to show the ratio. 6 strawberries 2 pineapples The ratio is 6 : 2

Grandma gave $15 to Li Li and Chin. Li Li had $7. (a)How much money did Chin get? (b)Find the ratio of the amount of money Li Li have to the amount of money Chin Chn have from Grandma? (a) 15 − 7 = 8 (Chin) (b) The ratio of the amount of money Li Li have to the amount of money Chin have is 7 : 8

Agnes sold packets of sweets to Halim and Kairi in the ratio 8: 13. He sold the sweets in 2 -kg packets. What was the smallest possible mass of sweets Agnes sold to both of them? Smallest mass of sweets sold to Halim 8 x 2 = 16 Smallest mass of sweets sold to Kairi 13 x 2 = 26 16 + 26 = 42 Ans: 42 kg

Lenny put 6 counters into a bag. She took out some counters from the bag but not all of the, What is the ratio of the number of counters taken from the bag to the number of counters left in the bag? Make a list of all possible ratios using the table below.

Number of counters taken out Number of counters left in the bag Ratio 1 5 1: 5 2 4 2: 4 or 1: 2 3 3 4 2 5 1 3: 3 or 1: 1 4: 2 or 2; 1 5: 1