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Year 1

Solve addition and subtraction problems involving length

I can solve addition and subtraction problems involving length.

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Share activities with pupils
New
New
Year 1

Solve addition and subtraction problems involving length

I can solve addition and subtraction problems involving length.

Download all resources
Share activities with pupils

Lesson details

Key learning points

  1. Addition and subtraction problems both involve a whole and its parts.
  2. You can think about addition and subtraction stories involving length and identify the whole and its parts.
  3. When you join two items together, you can add their lengths together to find the total length.
  4. When you remove part of an object, you subtract the amount you have removed to find the length of the remaining part.

Common misconception

Children may confuse standard and non-standard units, for example measuring the height of a tower by counting the blocks rather than using a ruler to measure its length in centimetres.

Use prompts such as, 'How many centimetres tall is this tower?' and, 'The first part of the tower is 10cm tall.' to reinforce the use of centimetres as a standard unit of measure.

Keywords

  • Part - A piece or section of the whole.

  • Whole - All of something. Complete.

Look for meaningful contexts within the classroom environment to explore further addition and subtraction problems involving length, for example cutting pieces of wool or string in DT lessons, or when growing plants in science.
Teacher tip

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).

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Starter quiz

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6 Questions

Q1.
What is the missing part in the part-part-whole model?
An image in a quiz
Correct Answer: 7, seven
Q2.
What is the missing whole in the bar model?
An image in a quiz
Correct Answer: 14, fourteen
Q3.
Which equation matches this representation of doubling?
An image in a quiz
5 + 5 = 10
Correct answer: 6 + 6 = 12
2 + 2 = 4
Q4.
19 is equal to plus 10
Correct Answer: 9, nine
Q5.
Match the doubling representations to their equations.
Correct Answer:🟢🟢🟢🔵🔵🔵,3 + 3 = 6

3 + 3 = 6

Correct Answer:⚫⚫⚫⚫⚫⚪⚪⚪⚪⚪,5 + 5 = 10

5 + 5 = 10

Correct Answer:🟣🟣🟣🟣🟡🟡🟡🟡,4 + 4 = 8

4 + 4 = 8

Q6.
Which equation does this ‘first, then, now’ story represent?
An image in a quiz
8 − 6 = 2
6 − 2 = 8
Correct answer: 8 − 2 = 6
8 − 8 = 6

Exit quiz

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6 Questions

Q1.
Look at the tower of blocks. It shows that 6 cm is a part and 10 cm is a part. 16 cm is the .
An image in a quiz
Correct Answer: whole
Q2.
True or false. If we change the order of the addends, the sum stays the same.
An image in a quiz
Correct answer: True
False
Q3.
Match the double number to the correct total.
Correct Answer:double 5 ,10

10

Correct Answer:double 6,12

12

Correct Answer:double 7,14

14

Q4.
Look at the part-part-whole model. Match the numbers to the correct words,
An image in a quiz
Correct Answer:5 is ,a part

a part

Correct Answer:15 is,the whole

the whole

Correct Answer:10 is,a part

a part

Q5.
Look at the playdough snake that Lucas made. The whole snake was 16 cm long. He snipped off a part and the part that was left was 6cm long. How long was the part that Lucas snipped off? cm.
An image in a quiz
Correct Answer: 10, 10 cm
Q6.
Which calculations could this part-part-whole model show?
An image in a quiz
10 cm + 18 cm = 8 cm
Correct answer: 18 cm − 10 cm = 8 cm
Correct answer: 18 cm = 10 cm + 8 cm