Year 2 - Maths
Explain what happens when you add and subtract ten to a multiple of ten
Composition of multiples of 10
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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 represent multiples of ten using numerals and names and use knowledge of facts and unitising to add and subtract multiples of ten.
Lesson Summary
You will learn to explain what happens when you add and subtract ten to a multiple of ten.
Key Notes
- Ten can be added to or subtracted from a multiple of ten.
- When you add ten to a multiple of ten the tens number increases by one
- When you subtract ten from a multiple of ten the tens number decreases by one
- If 3 + 1 is equal to 4 then 3 tens + 1 ten is equal to 4 tens which is equal to 40
Vocabulary To Learn
- Increase: Make something bigger (in size or quantity).
- Decrease: Make something smaller (in size or quantity).
- Multiple: A multiple is the result of multiplying a number by another whole number.
Common Mistakes To Avoid
- Children may not see the link between adding ones and adding tens. They may add or subtract one instead of ten or muddle addition and subtraction, so may subtract ten instead of add ten to a number.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Ten can be added to or subtracted from a multiple of ten. When you add ten to a multiple of ten the tens number increases by one.
2. Use this key word in a maths sentence and explain it clearly. 'Increase'
Make something bigger (in size or quantity). 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 see the link between adding ones and adding tens. They may add or subtract one instead of ten or muddle addition and subtraction, so may subtract ten instead of add ten to a number. Correction: Reinforce understanding of unitising by describing each group of objects in ones or tens, e.g. five cubes plus 1 cube, 5 tens plus 1 ten and talk through what is happening. Show this with equipment in tens and ones such as straws or cubes.
More Lessons In This Unit
- Add and subtract multiples of ten Study Guide
- Estimate the position of multiples of ten on a 0 - 100 number line Study Guide
- Explain that one ten is equivalent to ten ones Study Guide
- Represent multiples of ten in an expression or an equation Study Guide
- Represent multiples of ten using their numerals Study Guide
- Represent multiples of ten using their numerals and names Study Guide
- Solve problems involving multiples of ten Study Guide
- Solve problems involving multiples of ten in a range of contexts Study Guide
- Use knowledge of facts and unitising to add and subtract multiples of ten Study Guide
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