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New
Understand that multiplying by 10 makes a number ten times the size
I can understand that multiplying by 10 makes a number ten times the size.
Lesson 2 of 15
New
New
- Year 4
Understand that multiplying by 10 makes a number ten times the size
I can understand that multiplying by 10 makes a number ten times the size.
Lesson details
Key learning points
- Finding ten times as many is the same as multiplying by 10
- 10 is ten times the size of 1
- A digit in the tens column is 10 times the value of a digit in the ones column.
Keywords
Scaling - Scaling is when a given quantity is made ___ times the size.
Multiple - A multiple is the product of a number and an integer.
Common misconception
10 times the size and 10 times as many are achieved through the same operation but they are different.
Use sticky-tack or plasticine. Create 10 blobs that are equal in length to 1 blob that has been stretched. Encourage the children to see that the value of their length is the same but one is made of countable objects whereas the other is stretched.
Gattegno charts are a useful resource to have available throughout this lesson.
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
6 Questions
Q1.What number is being shown on the Gattegno chart?
What number is being shown on the Gattegno chart?
103
310
Q2.Which of these numbers is a multiple of 10?
Which of these numbers is a multiple of 10?
102
91
1,001
Q3.What is twice the size of 34?
What is twice the size of 34?
Q4.What is three times the size of 12?
What is three times the size of 12?
Q5.What is four times the size of 8?
What is four times the size of 8?
Q6.Andeep has ten times as many marbles as Jun. If Jun has 5 marbles, how many does Andeep have?
Andeep has ten times as many marbles as Jun. If Jun has 5 marbles, how many does Andeep have?
Assessment exit quiz
6 Questions
Q1.Jun has a sticky-tack worm that he measures at 2 cm long. He stretches it to be three times the size. How long will it be now? cm
Jun has a sticky-tack worm that he measures at 2 cm long. He stretches it to be three times the size. How long will it be now? cm
Q2.Match the quantities with the quantities that are ten times the size.
Match the quantities with the quantities that are ten times the size.
Q3.Which of the following operations should be used to find ten times the size?
Which of the following operations should be used to find ten times the size?
+ 10
− 10
÷ 10
Q4.Sofia has a slinky that she measures at 5 cm long. She stretches it to be ten times the size. How long will it be now? cm
Sofia has a slinky that she measures at 5 cm long. She stretches it to be ten times the size. How long will it be now? cm
Q5.What’s the multiplication being represented on this Gattegno chart?
What’s the multiplication being represented on this Gattegno chart?
4 × 10 = 40
40 ÷ 10 = 4
400 ÷ 10 = 40
Q6.True or false: 10 times as many and 10 times the size are the same.
True or false: 10 times as many and 10 times the size are the same.
True
