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Why is 21 divisible by 1 21 3 and 7?
Because 21 is a multiple of 1, 3, 7 and 21.
What is the divisible of 21?
The numeral '21' is evenly divisible by 21, 7, 3, and 1.
What is divisible in 21 and 37?
There is nothing that is divisible in 37 and 21. Because 37 is a prime number. However, 21 is divisible by 3 and 7.
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.
What numbers can be divided by 3?
The divisibility rule for 3 is as follows: If the sum of the digits of a number is divisible by 3 then the number is divisible by 3. For example, the number 21 is divisible by 3 since 2+1=3, and 3 is divisible by 3. The number 49 is not divisible by 3 since 4+9=13, and 13 is not divisible by 3.
Is 21 divisible by 2 3 or 5?
21 is not divisible by 2 nor 5, but it is divisible by 3. To be divisible by 2 the last digit must be even (one of {0, 2, 4, 6, 8}; the last digit 1 is not one of these, thus 21 is not divisible by 2 To be divisible by 3 sum the digits and if this total is divisible by 3, then so is the original number; the test can be repeated on the sum, so by repeatedly summing the digits of the totals until a single digit remains only if that single digit is 3, 6 or 9 is the original number divisible by 3. 21 → 2 + 1 = 3 which is divisible by 3 so 21 is divisible by 3. To be divisible by 5, the last digit must be 0 or 5. The last digit of 21 is 1 which is not 0 nor 5, thus 21 is not divisible by 5.
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
What numbers are 21 divisible by?
They are members of the infinite set of numbers of the form 21*k where k is an integer.
The numbers that 21 are divisible by?
1, 3, 7, 21
What number is divisible by 3 and 7?
21
What is the divisible of 63?
63 ÷ 3 = 21
Is 21 a prime number?
A prime number is any integer evenly divisible by only itself, and the number 1. Since 21 is divisible by 3 and 7, it is a composite number, not a prime number.No, 21 is not a prime number.21 is divisible by 1, 3, 7, & 21No. 21=3*7
