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Regrouping 21 ones are regrouped as 1 ten and 2 ones
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3 votes
Regrouping 21 ones are regrouped as 1 ten and 2 ones

User Nebenmir
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2 tens equal 20 and 1 = 21
User Hal
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3 votes
Regrouping 21 ones are regrouped as 2 tens and 1 ones.

10
10
01
---
21
User Ladookie
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8.1k points
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