Starter quiz
- Which picture shows one less than 12?
Which number would complete the part-part-whole model correctly?- 1
- 17 ✓
- 18
- 19
-
- Fill in the missing number. ___ is one more than 8
- '9' ✓
Find the missing number.- '3' ✓
- Alex is thinking of two numbers which have a difference of 1 One of the numbers is 15 What could the other number be?
- 14 ✓
- 15
- 16 ✓
- 17
-
Find the missing number.- '18' ✓
Exit quiz
Use a number line or one hundred square to help you find the missing number.- '64' ✓
- Which picture shows one less than 37?
Which number would complete the part-part-whole model correctly?- '61' ✓
Use the part-part-whole model to help you complete the equation. 43 - ______ = 42- '1' ✓
- Complete the stem sentence. ______ is one more than 76
- '77' ✓
- Tick the equations that would represent, '25 is one less than 26'
- 26 - 1 = 25 ✓
- 25 - 1 = 24
- 25 = 26 - 1 ✓
- 25 + 1 = 26 ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Finding one more is the same as adding 1. Finding one less is the same as subtracting 1
- Numbers that are one more or one less than each other have a difference of one.
Common misconception
The language of one more or one less than can confuse children, so 55 is one more than ? may be interpreted as 55 plus 1
Encourage children to articulate and explain in full sentences alongside number lines to support the understanding of the different ways to articulate the concept. Use stem sentences to support with this and display them around the classroom.
Keywords
One more - The number that is one more than another is the result of adding 1 to that number
One less - The number that is one less than another is the result of subtracting 1 from that number
Difference - The result of subtracting one number from another. How much one number differs from another.
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