Starter quiz
- What is the inverse operation of multiplication?
- Multiplication
- Division ✓
- Addition
- Subtraction
-
- Which of the following expression would undo multiplying a number by 100?
- × 100
- ÷ 100 ✓
- + 100
- − 100
-
- Match the numbers to the numbers that are one-tenth times the size.
- 80⇔8 ✓
- 40⇔4 ✓
- 30⇔3 ✓
- 110⇔11 ✓
- What is the missing number in the following equation? 7 = ______ ÷ 10
- '70' ✓
- What is the missing number in the following equation? 27 = ______ ÷ 10
- '270' ✓
- True or false: If you divide a number by 10 it becomes one-tenth the size.
- True ✓
- False
Exit quiz
What is the missing operation and number in the image shown?- × 100 ✓
- ÷ 100
- × 10
- ÷ 10
-
What is the missing operation and number in the image shown?- × 100
- ÷ 100 ✓
- × 10
- ÷ 10
-
- What is one-hundredth times the size of 800?
- '8' ✓
- What is one-hundredth times the size of 5,600?
- '56' ✓
- Which of the following describes the movement of digits on a place value chart when multiple of 100 is divided by 100
- The digits move 2 places to the left.
- The digits move 2 places to the right. ✓
- The digits move 1 place to the left.
- The digits move 1 place to the right.
-
- True or false? To divide a multiple of 100 by 100 you subtract two zeros.
- True
- False ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Dividing by one hundred moves all the digits two columns to the right making them one hundredth times the size.
- Multiples of 100 have zero in the tens and ones column.
- If you divide a multiple of 100 by 100, digits move two places right and the zeros in the ones and tens disappear.
Common misconception
Many pupils believe that 'subtracting 2 zeros' is dividing by 100 which can lead to difficulties later on when they are introduced to decimal numbers.
Don't dismiss it. It's a pattern that has been spotted and generalised. Do encourage the children to work with physical resources that don't involve the numbers themselves so they can see that it's not subtracting 2 zeros but changing place value.
Keywords
Scaling - Scaling is when a given quantity is made ___ times the size.
Inverse - Inverse means the opposite in effect. The reverse of.
Magnitude - A placeholder is where we use the digit zero to hold a place in a number and maintain place value.
Placeholder - The magnitude of a number is its distance from zero.
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