Starter quiz
- What is 40 + 40?
- 8
- 16
- 44
- 80 ✓
-
- 100 − 40 = ______
- '60' ✓
- What is the sum of 30, 30 and 10?
- 60
- 70 ✓
- 80
- 90
-
What is the value of the missing part in the bar model?- '20' ✓
- What is the missing number? ______ + 10 = 120
- '110' ✓
- Which pair of numbers do not add up to equal 90?
- 30 + 60
- 40 + 50
- 70 + 20
- 90 + 10 ✓
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Exit quiz
- Which of these numbers are multiples of a hundred?
- 300 ✓
- 500 ✓
- 650
- 900 ✓
-
- Which known fact could you use to help you calculate 500 + 300?
- 5 + 2 = 7
- 3 + 5 = 8 ✓
- 3 + 2 = 5
- 3 + 3 = 6
-
- What is 100 less than 600?
- '500' ✓
- Which pairs of numbers are equal to 600?
- 200 and 400 ✓
- 300 and 300 ✓
- 500 and 200
-
What is the value of the missing part in the bar model?- '100' ✓
Which pairs of numbers could be used to complete the bar model?- 100 and 700
- 200 and 500 ✓
- 300 and 400 ✓
- 600 and 100 ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Known facts can be used to help calculate with multiples of a hundred.
- If we know that 2 ones plus 4 ones equals 6 ones we know that 2 100s plus 4 100s equals 6 100s.
- Number facts to 10 can help us to add and subtract multiples of a hundred.
Common misconception
Pupils may find it difficult to connect calculating with hundreds with known facts.
Pupils need to be encouraged to 'unitise' hundreds to make calculation easier, seeing 500 as 5 lots of one hundred.
Keywords
Known facts - A known fact is something that you already know and can use to help you.
Multiple - A multiple is the result of multiplying a number by another whole number.
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