Year 2 - Maths
Use bridging to solve addition and subtraction problems
Adding and subtracting ones and tens to and from 2-digit numbers
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Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will add and subtract 1s and 10s from 2 digit numbers. They will use number facts to add/subtract a single-digit number to/from a 2-digit number. They will use a part-part-whole model to represent addition and subtraction.
Lesson Summary
You will learn to use bridging to solve addition and subtraction problems.
Key Notes
- We can use known facts to help us find new facts efficiently.
Vocabulary To Learn
- 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 Mistakes To Avoid
- 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.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
We can use known facts to help us find new facts efficiently. We can use known facts to help us find new facts efficiently.
2. Use this key word in a maths sentence and explain it clearly. '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. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: 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. Correction: Encourage children to record the numbers involved on bar models, number lines or in equations, then focus on what they notice about the numbers.
More Lessons In This Unit
- Add and subtract 1 to and from a 2-digit number crossing the tens boundary Study Guide
- Add and subtract 10 to and from a 2-digit number. Study Guide
- Add and subtract one to or from a two-digit number within a decade Study Guide
- Add by bridging a multiple of ten Study Guide
- Add multiples of 10 to 2-digit numbers. Study Guide
- Find 10 more or less than a 2-digit number. Study Guide
- Partition 2-digit numbers in different ways Study Guide
- Subtract by bridging a multiple of ten Study Guide
- Subtract multiples of ten from 2-digit numbers Study Guide
- Use efficient strategies to solve problems Study Guide
- Use number bonds to 10 to add/subtract one-digit and two-digit numbers Study Guide
- Use number facts to add or subtract a one-digit number and a two-digit number. Study Guide
- Use number facts to solve addition and subtraction problems. Study Guide
- Use number facts to solve problems in measures and data contexts Study Guide
Browse all guides in the Year 2 Maths guide library.