Starter quiz
- What is the missing number? 2 + = 30
- '28' ✓
- What is the missing number? − 5 = 8
- '13' ✓
- What is 25 + 7 − 5 = ______
- '27' ✓
- What is 178 + 40 − 30 = ______
- '188' ✓
- What is 135 + 99 = ______
- '234' ✓
- What is 201 − 24 + 25 = ______
- '202' ✓
Exit quiz
- What is the most efficient way of finding the missing number? + 298 = 301
- Add 301 and 298 together
- Subtract 298 from 301
- Add on from 298 to 301 ✓
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- Find the missing number. − 7 = 37
- 30
- 34
- 43
- 44 ✓
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- Find the missing number. 41 − ______ = 11
- '30' ✓
- Find the missing number. 402 + 50 − ______ = 412
- '40' ✓
- 41 snails are on a log. Some snails creep away. There are now 27 snails on the log. How many snails crept away?
- '14' ✓
- 285 people are on a train. At the next stop, 59 people get off and 60 get on. How many people are on the train now?
- '286' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- When a part is missing, subtract the other part from the whole.
- When the whole is missing, add the parts together.
- Look for the strategy which is most efficient.
Common misconception
Pupils may try to solve problems without thinking about the numbers involved.
Encourage pupils to look at the calculations and think about the numbers involved. Pupils may not get the most efficient method first time so encourage them to think about their responses and learn from what other children have done.
Keywords
Efficient - Working efficiently means finding a way to solve a problem quickly whilst also maintaining accuracy.
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