Year 4 - Maths
Use knowledge of the composition of 100 to multiply and divide by 100 in different ways
Understand what happens when a number is multiplied or divided by 10 and 100
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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 explain the relationship between multiplying and dividing a number by 10 and multiples of 10.
Lesson Summary
You will learn to use knowledge of the composition of 100 to multiply and divide by 100 in different ways.
Key Notes
- 100 is ten groups of ten or ten times ten.
- Multiplying by 100 is equivalent to multiplying by 10 and then multiplying by 10 again.
- Each time you multiply by 10 the digits move one place to the left in the place value chart.
Vocabulary To Learn
- Placeholder: A placeholder is where we use the digit 0 to hold a place in a number and maintain place value.
- Digit: A digit is one of the symbols of a number system. In our number system we use the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9
Common Mistakes To Avoid
- Pupils may not have much experience in using a Gattegno chart.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
100 is ten groups of ten or ten times ten. Multiplying by 100 is equivalent to multiplying by 10 and then multiplying by 10 again.
2. Use this key word in a maths sentence and explain it clearly. 'Placeholder'
A placeholder is where we use the digit 0 to hold a place in a number and maintain place value. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may not have much experience in using a Gattegno chart. Correction: Consider pre-teaching for children who lack confidence using Gattegno chart.
More Lessons In This Unit
- Explain how making a factor 10 times the size affects the product Study Guide
- Explain how making a factor 100 times the size affects the product Study Guide
- Explain how making the dividend 10 times the size affects the quotient Study Guide
- Explain how making the dividend 100 times the size affects the quotient Study Guide
- Explain the relationship between multiplying a number by 10 and multiples of 10 Study Guide
- Explain the relationship between multiplying a number by 100 and multiples of 100 Study Guide
- Explain the removal of placeholders when dividing whole numbers by 100 Study Guide
- Explain the use of placeholders when multiplying whole numbers by 100 Study Guide
- Scale division facts derived from multiplication facts by 100 Study Guide
- Scale known multiplication facts by 100 Study Guide
- Understand that dividing a number by 10 makes it one-tenth times the size Study Guide
- Understand that multiplying by 10 makes a number ten times the size Study Guide
- Use place value to explain placing a zero after the final digit when we multiply whole numbers by 10 Study Guide
- Use place value to explain removing the zero in the ones from a multiple of ten when we divide by 10 Study Guide
Browse all guides in the Year 4 Maths guide library.