Year 3 maths · D.4 · Add and Subtract to 100
Mentally add 10s to two-digit numbers
Add the tens. The ones stay the same.
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Eli asks: 51 + 40 =
Answer: 91
Chen says: 11 + 70 =
Answer: 81
Ivy thinks: 30 + 10 =
Answer: 40
Tip: Add the tens. The ones stay the same.
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Up next
- Next in this topic Mentally subtract 10s from two-digit numbers Year 3
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