Starter quiz
- Which one is not a complement to 100 ?
- 35 + 65
- 45 + 55
- 55 + 55 ✓
-
- What is the total of 17 + 83 ?
- '100' ✓
- Match the complements to 100
- 15⇔85 ✓
- 27⇔73 ✓
- 39⇔61 ✓
- 41⇔59 ✓
- 53⇔47 ✓
- What do you add to 69 to make 100 ?
- '31' ✓
- There are 100 cakes to sell at the school fair. 24 cakes have already been sold. How many are left to sell?
- '76' ✓
- Complete the sentence. When 2-digit numbers are complements to 100, the ones digits total ______ and the tens digits total 90
- '10' ✓
Exit quiz
The number of 10 p coins can be expressed as ______ tens.- '13' ✓
- Match the 3-digit number to the correct number of tens.
- 120⇔12 tens ✓
- 160⇔16 tens ✓
- 170⇔17 tens ✓
- 100⇔10 tens ✓
- 110⇔11 tens ✓
- Which equation shows one hundred and 3 more tens?
- 100 + 20 = 120
- 100 + 30 = 130 ✓
- 100 + 40 = 140
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What number is shown on the Gattegno chart?- '150' ✓
What number is missing from the bar model?- '30' ✓
- Sort the values from the smallest to the largest.
- 1⇔120
- 2⇔one hundred and 4 tens
- 3⇔one hundred and 7 tens
- 4⇔190
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- 3-digit multiples of ten can be expressed as a number of tens.
- 3-digit multiples of ten can be expressed as a number of hundreds and tens.
- The number of tens and the number of hundreds and tens are equivalent.
Common misconception
Pupils should not be encouraged to think about 'adding a zero' to the 2-digit numbers.
Make careful use of the stem sentences and representations to make sure that pupils are clear that e.g. 12 tens is equal to 120.
Keywords
Equal - Exactly the same amount or value.
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