New
New
Year 1

Calculate amounts up to 20 p

I can calculate amounts within 20 p

New
New
Year 1

Calculate amounts up to 20 p

I can calculate amounts within 20 p

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Lesson details

Key learning points

  1. Coins can be added in any order, but it is more efficient to group coins of the same value together.
  2. It is more efficient to add the greatest value coins first, or find coins that will help with using a mental strategy.
  3. When adding coins, known strategies can be used to help add efficiently.
  4. A number line can be used to help keep track of the coins added.

Common misconception

Children may start counting with the first coin they see or arranged them in a line in no particular order, leading to inefficient counting strategies instead of more efficient calculation methods.

Encourage children to group coins of the same value together and start with higher value coins, so they can apply the calculation strategies they already know to find the total value of a set of different coins.

Keywords

  • 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).

Video

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6 Questions

Q1.
Which coins show the most efficient way to make 13 p?
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q2.
Which coins show the most efficient way to make 11 p without using a 10 p coin?
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
Q3.
Here is a set of coins. Which totals can be made using only two of these coins? Can you find three different totals?
An image in a quiz
Correct answer: 11 p
Correct answer: 12 p
Correct answer: 3 p
13 p
Q4.
Which item can Alex buy using only two coins?
An image in a quiz
Correct answer: the pear
the melon
the banana
Q5.
Which statements are correct?
Correct answer: I can make 11 p with one 10 p and one 1 p coin.
Correct answer: I can make 11 p with two 5 p coins and one 1 p coin.
I can make 11 p using only 2 p coins.
Q6.
Alex has four coins of the same value. Their total value is 20 p. Which of the following does he have?
Four 2 p coins
Correct answer: Four 5 p coins
Four 10 p coins

6 Questions

Q1.
Which ten frame represents 13 p?
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q2.
Who has the most money - Jun or Sofia?
An image in a quiz
Correct answer: Sofia
Jun
Q3.
Sofia represents 12 p on a part-part-whole model. What is the missing part?
An image in a quiz
2 p
Correct answer: 10 p
1 p
Q4.
What could we say is the most efficient way to add 2 p, 5 p, 10 p and 2 p?
2 p + 5 p + 2 p + 10 p
10 p + 2 p + 5 p + 2 p
Correct answer: 10 p + 5 p + 2 p + 2 p
Q5.
Jun wants to count the coins as efficiently as possible. What could you tell him to help him?
Correct answer: Put coins with the same value together.
Put coins that are the same size together.
Correct answer: Start with the coin with the greatest value.
Start with the coin with the smallest value.
Q6.
Match the amounts that are equal.
Correct Answer:10 p + 2 p + 2 p,5 p + 5 p + 2 p + 2 p

5 p + 5 p + 2 p + 2 p

Correct Answer:5 p + 5 p + 5 p,5 p + 10 p

5 p + 10 p

Correct Answer:10 p + 5 p + 2 p,5 p + 2 p + 10 p

5 p + 2 p + 10 p