New
New
Year 4

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

New
New
Year 4

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

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Lesson details

Key learning points

  1. 1 is ten times smaller than 10 or one tenth the size.
  2. Dividing by ten makes the number ten times smaller or one tenth the size.
  3. 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 (2024), 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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6 Questions

Q1.
What is the missing factor in the equation? × 10 = 60
Correct Answer: 6
Q2.
What is the missing product in the equation? 32 × 10 =
Correct Answer: 320
Q3.
Match the numbers with those that are ten times their size.
Correct Answer:4,40

40

Correct Answer:12,120

120

Correct Answer:36,360

360

Correct Answer:23,230

230

Q4.
What is ten times the size of the number being represented by Base 10 blocks?
An image in a quiz
Correct Answer: 340
Q5.
What is ten times the size of the number being represented in the place value chart?
An image in a quiz
Correct Answer: 470
Q6.
What is ten times the size of the number being represented using place value counters?
An image in a quiz
Correct Answer: 540

6 Questions

Q1.
What is one tenth times the size of 40?
Correct Answer: 4
Q2.
The Base 10 blocks represent a number. What is one tenth times the size of the number shown?
An image in a quiz
Correct Answer: 5
Q3.
Match the numbers to the numbers that are one tenth times the size.
Correct Answer:60,6

6

Correct Answer:80,8

8

Correct Answer:20,2

2

Correct Answer:120,12

12

Q4.
What is the missing number in the following equation? 9 = ÷ 10
Correct Answer: 90
Q5.
What is the missing number in the following equation? 16 = ÷ 10
Correct Answer: 160
Q6.
True or false: To find one tenth times the size, divide by ten.
Correct answer: True
False