Work out how much change Amir receives.
Calculation problems — Notes & Worked Examples Show / Hide
Explanation:
For multi-step calculation problems, break the question into clear labelled steps so you gain method marks even if you make an arithmetic slip. Check that all money values are in the same units (either all in pounds £ or all in pence p) before adding or subtracting.
In division word problems with remainders, read the context carefully to decide whether to round up (e.g. coaches, boxes, or packs needed so nobody is left behind) or round down (e.g. how many full items you can afford to buy).
Example 1: Cinema tickets cost £8.50 for an adult and £5.25 for a child. Work out the change from £50 for 3 adults and 4 children.
Solution:
Example 2: 175 students and 14 teachers go on a school trip. Each coach holds 42 people. How many coaches are needed?
Solution:
Work out how much change Amir receives.
Work out how much change Amir receives.
Worked Solution & Answer
You must show all your working.
Worked Solution & Answer
Jim’s Store: 105p ÷ 3 = 35p per yoghurt M1
Jim’s Store is better value. A1
[ ] The 1000 ml bottle [ ] The 300 ml bottle
You must show all your working.
Worked Solution & Answer
The salad costs £3.
Theo’s total bill is £18.03.
Theo says,
‘This bill must be wrong.’
Explain why Theo is correct. [1 mark]
A can of lemon fizz costs £1.05.
She pays £9.45.
How much does a bottle of cola cost? [3 marks]
Worked Solution & Answer
£15.03 ÷ 5 = £3.006, which is not an exact amount of money in pence. C1
She needs 5 cans of lemon fizz, so she pays for 1 can: 1 × £1.05 = £1.05 M1
Remaining cost for 4 bottles of cola = £9.45 – £1.05 = £8.40
Cost of 1 bottle of cola = £8.40 ÷ 4 = £2.10. A1
She buys a sketch pad, a packet of pencils and an eraser, as shown below.
How much money does Georgia have left in her purse after she buys the paint? [2 marks]
Worked Solution & Answer
Pencils = £4.29 M1
Art eraser half price = £2.10 ÷ 2 = £1.05
Total = £6.50 + £4.29 + £1.05 = £11.84 A1
After paint = £8.16 - £2.75 = £5.41 A1
Give reasons for your answer. [3 marks]
Worked Solution & Answer
The charity put the information shown below on a poster.
Give your answer in pence. [2 marks]
Worked Solution & Answer
Show how you decide. [4 marks]
Worked Solution & Answer
Small: 210 ÷ 80 = 2.625p per bag M1
Medium: 355 ÷ 150 = 2.367p per bag M1
Large: 525 ÷ 220 = 2.386p per bag.
**Medium pack** is the best value because it has the lowest cost per tea bag A1
Words can be engraved on the bracelet and charms can be added.
The price list is shown below.
She also buys a heart charm.
What is the total cost of these items? [2 marks]
How many star charms did he buy? [1 mark]
How much cheaper is it to buy these items using the voucher than paying the usual price?
Worked Solution & Answer
Heart charm: £13.20
Engraving (5 letters): 5 × £0· 84 = £4· 20
Total cost = 45 + 13· 20 + 4· 20 = £62· 40. A1
Voucher price: £95
Saving = 117 - 95 = £22. A1