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Because all of those numbers are divisible by 21.

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Wiki User

6y ago
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Wiki User

7y ago

You could add 21 each time. Or write the 21 times table. Or use a spreadsheet. All three methods will prove that 21, 42, 63, 84, and 105 are multiples of 21.

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Raj Wakil

Lvl 2
3mo ago

21,63,84,105,?

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Q: How do you know 21 42 63 84 105 are the multiples of 21?
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