Starter quiz
- What is the next number in the count when counting forwards from 2? 2, 3, _
- 2
- 3
- 4 ✓
-
- What is the next number when counting back from 5? 5, 4, _
- 3 ✓
- 4
- 5
-
What is one more than 4?- 3
- 4
- 5 ✓
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- What is one less than 4?
- 3 ✓
- 4
- 5
-
What is the whole?- 1
- 3
- 4 ✓
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What is the whole?- 1
- 4
- 5 ✓
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Exit quiz
Which part-part-whole model is showing Laura’s cubes correctly partitioned?
Which part-part-whole model is showing Andeep’s cubes correctly partitioned?- One more than 3 is 4, so one less than 4 is _
- 2
- 3 ✓
- 4
-
- One less than 5 is 4, so one more than 4 is _
- 3
- 4
- 5 ✓
-
Laura thinks the missing number will be the same for both of these. Is she correct?- Yes ✓
- No
-
Andeep thinks the missing number will be the same for both of these. Is he correct?- Yes
- No ✓
-
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The number before a given number is one less than it.
- The number after a given number is one more than it.
- A staircase of blocks can be used to highlight one more and one less.
Common misconception
Children may confuse one more and one less, particularly when finding missing numbers.
Use the stem sentence ___ is one more / one less than ___ because it comes after / before it in our count.
Keywords
One more - The number after a given number is one more than it.
One less - The number before a given number is one less than it.
Before - A number that is before another comes earlier in our count.
After - A number that is after another comes later in our count.
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