Starter quiz
- Alex represents the equation 32 + 8 = ___ Which known fact could he use to solve it more efficiently?
- 2 + 8 ✓
- 3 + 8
- 3 + 2
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Use the picture to complete the stem sentence. We know that 7 plus 3 is equal to 10, so we also know that ______ plus 3 is equal to 30- '27' ✓
- Which of the following numbers will complete the equation? 65 + 5 = ___
- 60
- 70 ✓
- 80
-
- Which equation would be next in this pattern? 10 − 8 = 2, 20 − 8 = 12, 30 − 8 = 22 ...
- 38 − 8 = 30
- 40 − 8 = 32 ✓
- 48 − 8 = 40
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- What is the missing addend in the next equation? Remember, you can partition the two-digit number to help you see the ones more clearly. 52 + 8 = 60, 53 + 7 = 60, 54 + ______ = 60 ...
- '6' ✓
- I know that 10 − 1 = 9, so I also know that 30 − 1 = ______
- '29' ✓
Exit quiz
- Which representation shows that the ‘bridge 10’ strategy has been used to solve 7 + 5 = 12?
- How would 6 be partitioned to ‘bridge 10’ in this equation? 8 + 6 = 14
- 1 and 5
- 2 and 4 ✓
- 3 and 3
-
How can we solve this equation? 16 + 7 = ___- Partition 7 into 1 and 6
- Partition 7 into 5 and 2
- Partition 7 into 4 and 3 ✓
-
- 55 + 7 = ______
- '62' ✓
Look at the number line. What is the missing multiple of 10?- '90' ✓
What is the missing addend on this number line?- '6' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- When adding a single digit and a two-digit number, the equation can be solved more efficiently by 'bridging ten.'
- When bridging a multiple of ten, the second addend is partitioned so that it reaches the next multiple of ten.
- Bridging ten is an efficient strategy because number pairs to ten can be used to calculate more easily.
Common misconception
Children may partition the second addend in a way that does not allow them to make use of the multiple of ten and use their number bonds to calculate efficiently.
Use ten frames and number lines to support children in finding the multiple of ten and partition the addend in different ways to compare the efficiency of different ways of partitioning.
Keywords
Bridge - A mental strategy which uses addition or subtraction to cross a number boundary.
Partition - The act of splitting an object or value down into smaller parts.
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