Starter quiz
- Which equation has been written to find the difference between 9 and 6?
- 9 + 6 = ?
- 9 - 6 = ? ✓
- 6 - 9 =?
-
- 9 and 6 have a difference of ______
- '3' ✓
Here, we are finding the difference between…- 2 and 5
- 5 and 7 ✓
- 7 and 2
-
How many have we ‘counted on’ on the number line?- '3' ✓
- Which pairs of numbers have the same difference of 5?
- 10 and 4
- 9 and 4 ✓
- 8 and 3 ✓
- 7 and 3
-
- If I know the difference between 10 and 6 is 4, working backwards, I also know the difference between ___ and ___ is 4
- 9 and 5 ✓
- 8 and 4 ✓
- 7 and 4
- 6 and 2 ✓
- 5 and 3
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Exit quiz
- When would we be best to use the ‘counting on’ strategy to find the difference?
- When the numbers are close together. ✓
- When the numbers are far apart.
- If we cannot work out the answer.
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- If a book costs £4 and a toy car costs £12, how would we efficiently calculate the difference in price?
- Subtract £4 from £12 ✓
- Count on from £4 to £12
- Add £4 and £12
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- A teddy costs £9 and a toy car costs £12, how would we calculate the difference in price?
- Subtract £9 from £12
- Count on from £9 to £12 ✓
- Add £9 and £12
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- It takes Sofia 4 minutes to walk to school. It takes Jun 12 minutes to walk to school. How much longer does it take Jun to walk to school than Sofia? ______ minutes.
- '8' ✓
- Jacob wants to buy a new pencil case that costs £12 and he has saved £9 so far. How much more money does Jacob need to save? £______
- '3' ✓
- When playing a game, the difference between Izzy’s score and Lucas’ score is 3, Izzy scored 9 so how many points could Lucas have scored?
- '12' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- You calculate the difference by counting on from the known part to the whole.
- The difference is the answer to a subtraction calculation.
- The difference is one of the parts that make the whole.
Common misconception
Children think that 'counting on' is used solely as a strategy in addition.
Children should be made aware that the strategy for 'counting on' can be used in addition but is used as a strategy for subtraction in this lesson where we are finding the difference between two numbers close in value.
Keywords
Difference - The amount which a number is greater or smaller.
Subtraction - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Count on - A mental strategy used to add numbers.
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