New
New
Year 1

# Find and make amounts within 20 p

I can calculate and make given amounts within 20 p.

New
New
Year 1

# Find and make amounts within 20 p

I can calculate and make given amounts within 20 p.

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## Lesson details

### Key learning points

1. A combination of different coins can be used to make the same total value.
2. It is more efficient to use fewer coins to pay for an item.
3. Using coins of a greater value where possible will result in fewer coins being used.
4. With prices between 10 p and 20 p, partitioning the price into '10 and a bit' allows more efficient working.

### Common misconception

Children may start counting out using any coins available instead of thinking of the whole amount needed first and partitioning it into manageable parts where they can deploy known strategies.

Encourage children to partition teen numbers using a part-part-whole model and use what they know about making 10, and the numbers up to 10, to find combinations that use the fewest possible coins to total a given value.

### Keywords

• Total value - Where referring to money, value refers to how much something is worth. The total value can be found by adding the value of each coin in a set.

• Efficiently - Not wasting time or effort. An efficient strategy is one we can carry out easily.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
What is the total value of these coins? p
Q2.
Which set of coins could you use to pay for the teddy?
Correct Answer: An image in a quiz
Correct Answer: An image in a quiz
Q3.
What is the total value of this set of coins? p
Correct Answer: 8, 8 p, 8p
Q4.
Which coins show a total of 10 p?
Correct Answer: An image in a quiz
Correct Answer: An image in a quiz
Q5.
Aisha wants to pay for a toy costing 9 p in the most efficient way. Which set of coins should she choose?
Correct Answer: An image in a quiz
Q6.
Alex has some coins which have a total value of 7 p. One of his coins is a 5 p coin. Which other coin does he need?
5 p coin
1 p coin

## Exit quiz

### 6 Questions

Q1.
Which coins show the most efficient way to make 12 p?
Correct Answer: An image in a quiz
Q2.
Which coins show the most efficient way to make 12 p without using a 10 p coin?
Correct Answer: An image in a quiz
Q3.
Which totals can be made using these coins? (You only have one of each.)
11 p