BUILD FLUENCY. EARN YOUR ASCENT.Sign in Year 3
Estimate sensible totals and choose calculations that match practical situations.
Free examples and worked answers. No account needed.
Practise the method.
Estimate sensible totals and choose calculations that match practical situations.
Estimate sensible totals and choose calculations that match practical situations.
Example 1
There are 216 people at a fair. 83 more arrive, then 74 leave. How many people remain?
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Answer: 225
- Arriving adds people: 216+83=299.
- Leaving subtracts people: 299−74=225 people.
Example 2
There are 149 people at a fair. 89 more arrive, then 37 leave. How many people remain?
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Answer: 201
- Arriving adds people: 149+89=238.
- Leaving subtracts people: 238−37=201 people.
Example 3
A school counted 426 hats and 106 caps. Round each count to the nearest hundred, then estimate the total.
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Answer: 500
- 426 rounds to 400; 106 rounds to 100.
- Add the rounded counts: about 500 hats and caps.
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