Video: KS2-M19 • Paper 3 • Question 16

Jack buys 1 1/2 kg of potatoes and 1/2 kg of carrots. How much change does he get from £5?

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Video Transcript

Jack buys one and a half kilograms of potatoes and half a kilogram of carrots. How much change does he get from five pounds?

We know that one kilogram of potatoes is one pound 50. And Jack buys one and a half kilograms of potatoes. Half of a kilogram of potatoes will cost half of one pound 50. One pound 50 is 150 pence. So what is half of 150? Half of 100 is 50, and half of 50 is 25. So half a kilogram of potatoes costs 75 pence. One pound 50 plus 75 equals two pounds 25.

Jack also buys half a kilogram of carrots. We know that one kilogram costs one pound 80 or 180 pence. Half of 180 is 90.

Next, we need to add together the cost of the potatoes and the carrots. And then we have to work out how much change Jack would get from his five-pound note. Two pound 25 and 90 pence costs three pounds 15. One and a half kilograms of potatoes and half a kilogram of carrots costs three pounds 15. How much change would Jack get from his five-pound notes if he paid three pounds and 15 pence?

85 and 15 are a pair of numbers that make 100. So if we add 85 pence to three pounds 15, that will take us to four pounds. Four and one makes five. So we know that three pounds 15 and one pounds 85 totals five pounds. So Jack will get one pound 85 in change from his five pounds.

To find the answer, first we calculated the cost of one and a half kilograms of potatoes, which was two pounds 25. Then we calculated the cost of half a kilogram of carrots, which was 90 pence. Then we added these two amounts together to tell us the total amount that Jack has spent. Then we found the difference between three pounds 15 and five pounds to give us the amount of change that jack should get. He will get one pound 85 in change from his five-pound note.

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