New
New
Year 4

Use knowledge of the composition of 100 to multiply and divide by 100 in different ways

I can use knowledge of the composition of 100 to multiply and divide by 100 in different ways

New
New
Year 4

Use knowledge of the composition of 100 to multiply and divide by 100 in different ways

I can use knowledge of the composition of 100 to multiply and divide by 100 in different ways

Lesson details

Key learning points

  1. 100 is ten groups of ten or ten times ten.
  2. Multiplying by 100 is equivalent to multiplying by 10 and then multiplying by 10 again.
  3. Each time you multiply by 10 the digits move one place to the left in the place value chart.

Common misconception

Pupils may not have much experience in using a Gattegno chart.

Consider pre-teaching for children who lack confidence using Gattegno chart.

Keywords

  • 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

As much as possible and through prompting and discussion, get the pupils to make the generalisation that multiplying by 100 is equivalent to multiplying by 10 and then multiplying by 10 again as 10 multiplied by 10 is equal to 100
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).

Loading...

6 Questions

Q1.
What is the number being shown on the Gattegno chart?
An image in a quiz
Correct Answer: 240
Q2.
What is the number being shown on the Gattegno chart?
An image in a quiz
Correct Answer: 3,010
Q3.
What is the number being shown on the place value chart?
An image in a quiz
Correct Answer: 42
Q4.
What is the number being shown on the place value chart?
An image in a quiz
3,400
Q5.
What is the missing number in the following equation? 10 × 8 = 70 +
Correct Answer: 10
Q6.
What is the missing number in the following equation? 3 × 100 = 150 ×
Correct Answer: 2

6 Questions

Q1.
What is the equation being represented on this Gattegno chart?
An image in a quiz
2 × 10 = 20
Correct answer: 20 × 10 = 200
20 ÷ 10 = 2
200 ÷ 10 = 20
Q2.
What is the equation being represented on this Gattegno chart?
An image in a quiz
3 × 10 = 30
30 × 10 = 300
Correct answer: 300 ÷ 100 = 3
300 ÷ 10 = 30
Q3.
Match the equivalent expressions.
Correct Answer:2 × 100,2 × 10 × 10

2 × 10 × 10

Correct Answer:20 × 10 × 10 ,20 × 100

20 × 100

Correct Answer:2,000 ÷ 100 ,2,000 ÷ 10 ÷ 10

2,000 ÷ 10 ÷ 10

Correct Answer:200 ÷ 100 ,200 ÷ 10 ÷ 10

200 ÷ 10 ÷ 10

Q4.
Match the equivalent expressions.
Correct Answer:12 × 100 ,12 × 10 × 10

12 × 10 × 10

Correct Answer:8 × 10 × 10 ,8 × 100

8 × 100

Correct Answer:8,400 ÷ 100 ,8,400 ÷ 10 ÷ 10

8,400 ÷ 10 ÷ 10

Correct Answer:500 ÷ 100 ,500 ÷ 10 ÷ 10

500 ÷ 10 ÷ 10

Q5.
What is the missing number in the following equation? 11 × 10 × 10 = 11 ×
Correct Answer: 100
Q6.
What is the missing number in the following equation? 3,400 ÷ 100 = 3,400 ÷ ÷ 10
Correct Answer: 10