Explain how to multiply and divide a number by 10, 100 and 1,000
I can explain how to multiply and divide a number by 10, 100 and 1,000
Explain how to multiply and divide a number by 10, 100 and 1,000
I can explain how to multiply and divide a number by 10, 100 and 1,000
Lesson details
Key learning points
- When you multiply by 10, 100 or 1,000, the digits move one, two or three places to the left respectively.
- When you divide by 10, 100 or 1,000, the digits move one, two or three places to the right respectively.
Keywords
Tenth - One-tenth is one part in ten equal parts.
Hundredth - One-hundredth is one part in one hundred equal parts.
Thousandth - One-thousandth is one part in one thousand equal parts.
Common misconception
Children may 'add' a zero when multiplying or vice versa when dividing. Children may place a zero at the end of the decimal fraction when multiplying, or vice versa when dividing.
When we 'add' zero, the value of the number does not change. When we multiply or divide by a power of 10, we need to move all the digits the appropriate spaces to the left/right even if this means bridging one and moving into the decimal places.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Look at the Gattegno chart. Which number is being represented?
Q2.Match the expressions to their product.
900
90
9
20
200
0
Q3.When a number is multiplied by one hundred, the digits are moved __________ place value places to the left.
Q4.Match the equations to their product.
7,000
7
5
500
50
30
Q5.Sofia is thinking of a number. Her number is ten times the size of 0.4 What is her number?
Q6.Lucas is thinking of a number. His number is one hundredth times the size of 8 What is his number?
Assessment exit quiz
6 Questions
Q1.When we multiply 0.95 by 100, what is the new value of the 9 digit?
Q2.1.04 × 10 =
Q3.0.03 ÷ 10 = .
Q4.Match the expression to its product.
7.2
720
48.2
482
9.1
91