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This is because the 1 occupies a placeholder that is greater by a factor of 10 (hence 1*10 = 10). For example, if we wanted to add 48+26,

48

26

-------

14

1

48

26

-------

74

Here, the 1 occupies the tens place, so it represents a 10.

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13y ago

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Q: Why 1 is equivalent to 10 when regrouping?
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