Find a missing part when one part and the whole is known | Maths

Starter quiz

Is 5 the whole or a part?
- Whole ✓
- Part
Is 1 the whole or a part?
- Whole
- Part ✓
What is the whole?
- 1
- 2
- 3
- 4 ✓
Sofia has 1 counter and Jun has 2 counters. Which part-part-whole model is showing their counters?
Which part-part-whole model is showing Sofia’s objects correctly partitioned?
Which part-part-whole model is showing Jun’s objects correctly partitioned?

How many cubes is the whole made up of?
- 2
- 3
- 4
- 5 ✓
Sofia has 3 counters and Jun has 2 counters. Which part-part-whole model correctly shows the parts combining to make the whole?
How many cubes are in the missing part?
- 1 ✓
- 2
- 3
- 4
- 5
Sofia thinks the missing part will be 3. Is this correct?
- Yes
- No ✓
Jun thinks the missing part will be the same for these part-part-whole models. Is he correct?
- Yes ✓
- No
Sofia thinks the missing part will be the same for these part-part-whole models. Is she correct?
- Yes
- No ✓

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Children may 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.

Partition - Partition means to split up a whole into parts.
Part-part-whole model - A part-part-whole model is a pictorial representation that shows the whole and its parts.
Missing part - A missing part means one of the parts that cannot be seen.