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Lesson 4 of 15
Understand that dividing a number by 10 makes it one-tenth times the size
I can understand that dividing a number by 10 makes it ten times smaller or one tenth the size
Lesson 4 of 15
New
New
Understand that dividing a number by 10 makes it one-tenth times the size
I can understand that dividing a number by 10 makes it ten times smaller or one tenth the size
Lesson details
Key learning points
- 1 is ten times smaller than 10 or one tenth the size.
- Dividing by ten makes the number ten times smaller or one tenth the size.
- Dividing by ten is the inverse of multiplying by ten.
Keywords
Scaling - Scaling is when a given quantity is made ___ times the size.
Inverse - Inverse means the opposite in effect or the reverse of.
Common misconception
One-tenth times the size may be a confusing phrase to use because pupils are used to seeing an increase when using '___ times as many'.
Ensure that children understand that a one is one-tenth times the size of a ten. Base 10 is an excellent resource for this. Then gradually increase the ones and the corresponding tens.
Ensure that you use the phrase 'one-tenth times the size' as often as possible in different contexts. Write it on the learning wall and praise children for making use of it in context.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), 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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Prior knowledge starter quiz
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6 Questions
Q1.What is the missing factor in the equation? × 10 = 60
What is the missing factor in the equation? × 10 = 60
Q2.What is the missing product in the equation? 32 × 10 =
What is the missing product in the equation? 32 × 10 =
Q3.Match the numbers with those that are ten times their size.
Match the numbers with those that are ten times their size.
40
120
360
230
Q4.What is ten times the size of the number being represented by Base 10 blocks?
What is ten times the size of the number being represented by Base 10 blocks?
Q5.What is ten times the size of the number being represented in the place value chart?
What is ten times the size of the number being represented in the place value chart?
Q6.What is ten times the size of the number being represented using place value counters?
What is ten times the size of the number being represented using place value counters?
Assessment exit quiz
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6 Questions
Q1.What is one tenth times the size of 40?
What is one tenth times the size of 40?
Q2.The Base 10 blocks represent a number. What is one tenth times the size of the number shown?
The Base 10 blocks represent a number. What is one tenth times the size of the number shown?
Q3.Match the numbers to the numbers that are one tenth times the size.
Match the numbers to the numbers that are one tenth times the size.
6
8
2
12
Q4.What is the missing number in the following equation?
9 = ÷ 10
What is the missing number in the following equation?
9 = ÷ 10
Q5.What is the missing number in the following equation? 16 = ÷ 10
What is the missing number in the following equation? 16 = ÷ 10
Q6.True or false: To find one tenth times the size, divide by ten.
True or false: To find one tenth times the size, divide by ten.
False