Year 2 - Maths
Explain what the difference is between consecutive numbers
Calculating within 20
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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 3 addends. They will use a strategy such as finding 2 addends to total 10 or 2 numbers to bridge though 10.
Lesson Summary
You will learn to explain what the difference is between consecutive numbers.
Key Notes
- Consecutive numbers have a difference of 1
- Consecutive numbers are one more than the one before.
- Consecutive numbers are one less than the one after.
- Consecutive odd numbers have a difference of 2
- Consecutive even numbers have a difference of 2
Vocabulary To Learn
- Consecutive: Numbers which follow each other in order, without gaps.
- Odd: Any integer (not a fraction) that cannot be divided exactly by 2 The last digit is 1, 3, 5, 7 or 9
- Even: Any integer that can be divided exactly by 2 The last digit is 0, 2, 4, 6 or 8
- Difference: The result of subtracting one number from another. Way in which two or more things we are comparing are not the same.
Common Mistakes To Avoid
- Children may not recognise given subtraction calculations that involve consecutive numbers and will resort to other strategies to calculate.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Consecutive numbers have a difference of 1. Consecutive numbers are one more than the one before.
2. Use this key word in a maths sentence and explain it clearly. 'Consecutive'
Numbers which follow each other in order, without gaps. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Children may not recognise given subtraction calculations that involve consecutive numbers and will resort to other strategies to calculate. Correction: Recording equations alongside concrete or pictorial representations (such as cubes or a number line) will help children to visualise the difference and become more confident in spotting equations that contain consecutive numbers.
More Lessons In This Unit
- Add and subtract two numbers that bridge through 10 Study Guide
- Add three addends Study Guide
- Add three addends efficiently Study Guide
- Add three addends efficiently by finding two addends that total 10 Study Guide
- Add two numbers that bridge through 10 Study Guide
- Calculate the difference Study Guide
- Calculate the difference in different contexts Study Guide
- Calculate the difference when information is presented in a bar chart Study Guide
- Calculate the difference when information is presented in a pictogram Study Guide
- Compare the number of objects in two sets or difference between two measures. Study Guide
- Explain that the addends can be added in any order Study Guide
- Use a 'First, then, then, now' story to add three addends Study Guide
- Use knowledge of calculating within 20 to solve problems Study Guide
- Use knowledge of calculating within 20 to solve problems involving statistics Study Guide
Browse all guides in the Year 2 Maths guide library.