Starter quiz
What number is being shown on the Gattegno chart?- 333
- 3.303 ✓
- 3,330
-
- What is twice the size of 120?
- '240' ✓
- Which of these numbers is a multiple of 10?
- 405
- 60 ✓
- 99
- 2,050 ✓
-
- What is the missing number in the following equation? 23 = ______ ÷ 10
- '230' ✓
- Packs of pencils contain 10 pencils. There are 11 packs. Which equation shows how many pencils there are?
- 11 × 10 = 110 ✓
- 11 + 10 = 21
- 11 × 11 = 132
-
- True or false: To find one-tenth times the size, divide by ten.
- True ✓
- False
Exit quiz
- What is the missing factor in the equation? ______ × 100 = 800
- '8' ✓
- All multiples of one hundred have both a tens and ones digit of zero. True or False?
- True ✓
- False
- Jars of marbles contain 100 marbles altogether. There are 4 jars in the classroom. Which equation shows how many marbles are in the classroom altogether?
- 4 × 100 = 400 ✓
- 4 + 100 = 104
- 4 × 4 × 100 = 1,600
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- Tick the numbers that are multiples of 100
- 460
- 250
- 108
- 900 ✓
- 600 ✓
-
- Tick the numbers that are multiples of 100
- 3,860
- 4,600 ✓
- 1,020
- 2,000 ✓
- 2,001
-
- True or false: All multiples of one-hundred have a digit greater than zero in the hundreds.
- True
- False ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- Finding one hundred times as many is the same as multiplying by 100
- When a number is multiplied by one hundred the product is a multiple of one hundred.
- Multiples of 100 have zero in the tens and ones column.
- Multiplying by one hundred moves all the digits two columns to the left making the digits one hundred times the size.
Common misconception
Pupils may start talking of 'adding 2 zeros' to multiply by 100
Don't dismiss this as it is disguising an understanding of a pattern but reassure the pupils that this will be explained later through place value discussions in the coming lessons.
Keywords
Multiple - A multiple is the result of multiplying a number by another whole number.
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
Placeholder - A placeholder is where we use the digit zero to hold a place in a number and maintain place value.
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