Identify a missing part when a whole is partitioned into two parts | Maths

Starter quiz

What type of numbers are shown on the number line?
- Even numbers
- Odd numbers ✓
What number has been partitioned and shown in the bar model?
- '10' ✓
What is the missing part in this number line representation?
- '4' ✓
Match the numbers so that they combine to make 8 as the whole.
- One part is 0
  
  ⇔
  
  One part is 8 ✓
- One part is 3
  
  ⇔
  
  One part is 5 ✓
- One part is 7
  
  ⇔
  
  One part is 1 ✓
Lucas is going to clap 6 times. He has already clapped 2 times. How many more claps does he need to do?
- '4' ✓
What is the missing part?
- '3' ✓

Look at the bar model. What is the missing part?
- '6' ✓
Lucas has 7 counters in total. How many are hidden in his hand?
- '4' ✓
Jacob is going to hop 8 times. He has already hopped 4 times. How many more hops does he need to do?
- '4' ✓
A ladybird is climbing up a flower. The flower is 9 cm tall and the ladybird is 2 cm up. How much further does it need to go? ______ cm
- '7' ✓
Jacob and Laura are both counting cars. Jacob counts 3 cars. Laura counts 6 cars. What is the whole? ______ cars
- '9' ✓
Jacob and Laura counted 10 cars. Tick the options that could show what Jacob and Laura counted.
- Jacob counted 3 cars and Laura counted 6 cars.
- Jacob counted 3 cars and Laura counted 7 cars. ✓
- Jacob counted 5 cars and Laura counted 5 cars. ✓
- Jacob counted 9 cars and Laura counted 0 cars.
- Jacob counted 9 cars and Laura counted 1 car. ✓

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Numbers can represent measures when a part is missing.
Each of the numbers six to ten can be partitioned into two parts in different ways.
If we know one part we can find the other part.
A bar model can be used to represent the whole number and a missing part.
Knowing about odd and even parts means you know if the missing part is odd or even.

Children may confuse the part and the whole, or add the whole and one part to find the missing part.

Encourage the use of the stem sentence ___ is the whole, ___ is a part and ___ is a part, to reinforce what the numbers represent.