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Year 4

Scale known multiplication facts by 100

I can scale known multiplication facts by 100

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New
New
Year 4

Scale known multiplication facts by 100

I can scale known multiplication facts by 100

Download all resources
Share activities with pupils

Lesson details

Key learning points

  1. If one factor is made one hundred times the size, the product will be one hundred times the size.
  2. One factor has been multiplied by 100 so the product is multiplied by 100
  3. When multiplying two numbers, if either factor is made 100 times the size, the product will be 100 times the size.
  4. 6 multiplied by 300 is equal to 600 multiplied by 3 or 6 hundreds multiplied by 3

Common misconception

Times tables recall is crucial in these lessons. It provides the platform for children to extend their understanding in combination with what they know about place value.

For children who struggle with times table recall, give them a times table grid to refer to. This lesson is teaching the concept of scaling, not testing their knowledge of times tables.

Keywords

  • Scaling - Scaling is when a given quantity is made ___ times the size.

  • Factor - A factor is a number which exactly divides another whole number.

  • Product - A product is the result of two or more numbers multiplied together.

Some of your pupils may want to know what happens when both factors are scaled up. Don't dismiss this if it comes up but be reminded that this may overcomplicate calculations for the whole class. Explain that this is something for future learning but excellent conjecture and pattern spotting.
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).

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Starter quiz

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6 Questions

Q1.
Which of the numbers in the following equation are factors? 40 × 7 = 280
Correct answer: 40
Correct answer: 7
280
Q2.
Match the times table expression with the correct product.
Correct Answer:12 × 7,84

84

Correct Answer:7 × 6,42

42

Correct Answer:8 × 11,88

88

Correct Answer:9 × 9,81

81

Q3.
Which of these times table facts is being shown by the array?
An image in a quiz
6 × 6 = 36
8 × 6 = 48
6 × 8 = 48
Correct answer: 6 × 7 = 42
Q4.
Match the expressions showing commutativity.
Correct Answer:5 × 40 ,40 × 5

40 × 5

Correct Answer:90 × 8 ,8 × 90

8 × 90

Correct Answer:3 × 60,60 × 3

60 × 3

Correct Answer:20 × 4 ,4 × 20

4 × 20

Q5.
Tick the expressions that this array is showing.
An image in a quiz
50 × 6
3 × 80
Correct answer: 4 × 70
70 × 3
8 × 50
Q6.
True or false? To multiply a whole number by 100, you add two zeros.
True
Correct answer: False

Exit quiz

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6 Questions

Q1.
What is the missing factor in the multiplication shown? 4 × = 400
Correct Answer: 100
Q2.
Which of the following statements describes the image below?
An image in a quiz
Correct answer: 4 has been scaled up by 100 to become 400
4 has been scaled up by 10 to become 400
4 has been scaled down by 100 to become 400
4 has been scaled down by 10 to become 400
Q3.
Tick the multiplication equations being shown by the array.
An image in a quiz
Correct answer: 3 × 500 = 1,500
Correct answer: 500 × 3 = 1,500
1,000 + 500 = 1,500
Correct answer: 5 × 300 = 1,500
Correct answer: 300 × 5 = 1,500
Q4.
5 × 900 =
Correct Answer: 4,500, 4500
Q5.
1,200 × 7 =
Correct Answer: 8,400, 8400
Q6.
Sofia is carrying boxes of sauce sachets into the school kitchen. Each box contains 600 sachets. She carries in 8 boxes. How many sachets is that in total? sachets
Correct Answer: 4,800, 4800