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Earn +20 ptsQ: What number is 21 divisible by?
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Example of divisibility rule for 21?
a number is divisible by 12 if the number is also divisible by both 3 and 7. You mean a number is divisible by 21 if it is divisible by 3 and 7.
Why is the number 21 composite?
Because 21 is divisible by numbers other than 1 and 21. 21 is divisible by 1, 3, 7, 21
Explain why 21 is not a prime number?
21 has factors other than 1 and itself, so it is not a prime number. For example, it is divisible by 3. (You can check this by adding the digits of the number: 2 + 1 = 3. If the sum of the digits is divisible by 3, the number is also divisible by 3.) Therefore, 21 is a composite number.
What number is even divisible by 3 and a multiple of 7?
Forty-two.
These number are divisible by 3 and 7?
Any multiple of 21.
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