New
New
Year 2
Use bridging to solve addition and subtraction problems
I can use bridging to solve addition and subtraction problems.
New
New
Year 2
Use bridging to solve addition and subtraction problems
I can use bridging to solve addition and subtraction problems.
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Lesson details
Key learning points
- We can use known facts to help us find new facts efficiently.
Keywords
Bridge - A strategy that involves using a multiple of ten as a 'bridge', so numbers can be partitioned to make use of bonds to ten.
Common misconception
When solving problems, particularly in new contexts, children may revert to inefficient strategies as they are focusing on the problem rather than the number involved.
Encourage children to record the numbers involved on bar models, number lines or in equations, then focus on what they notice about the numbers.
Encourage children to draw/make bar models to draw attention to the structure of the problem. When finding the difference, link equations with a missing addend or subtrahend to the 'difference' structure to build understanding that it can mean both how many more and how many less/fewer.
Teacher tip
Licence
This content is © Oak National Academy Limited (2024), licensed on
Open Government Licence version 3.0
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Starter quiz
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6 Questions
Q1.
Look at the ten frames. Which equation does the image represent by showing ‘bridging 10’ to subtract?
10 − 2 = 8
8 − 2 = 6
Q2.
Look at the number line. How should 8 be partitioned to ‘bridge 10’ when subtracting?
Partition into 4 and 4
Partition into 6 and 2
Q3.
How could we solve this equation? 23 − 6 = ?
Partition 6 into 4 and 2
Partition 6 into 2 and 4
Q4.
Which number is missing from this number line?
Q5.
Look at the number line. What is the missing multiple of ten?
Q6.
54 − 6 =
Exit quiz
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6 Questions
Q1.
Which equation would be used to solve this problem? There were 42 children. 7 were sitting down and the rest were standing up. How many were standing up?
42 + 7 = 49
Q2.
Alex had put 47 cubes into the tray and then he found 6 more. How many cubes are there altogether? cubes.
Q3.
Sam collected 54 pencils. He kept some to use and put some away in a pot. He put 46 in the pot. How many does he now have to use? pencils.
Q4.
Which of these equations can be solved by bridging a multiple of 10?
35 + 3 =
66 + 2 =
Q5.
Which of these equations can be solved by bridging a multiple of 10?
35 − 3 =
67 − 6 =
Q6.
Which of these known facts could help you in solving this equation? 46 + 8 = ___
4 + 8 = 12
8 + 4 = 12