Is the number 21 divisible by 4?
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Is the number 21 divisible by 4?
To determine if 21 is divisible by 4, we apply the divisibility rule for 4.
The rule states that a number is divisible by 4 if the number formed by its last two digits is divisible by 4. Since 21 only has two digits, we consider the entire number.
Checking if 21 is divisible by 4:
We calculate .
The quotient is 5 with a remainder of 1, since and .
Since there is a remainder, 21 is not divisible by 4. According to the divisibility rule, if there is any remainder other than zero, the number is not divisible.
Therefore, the correct conclusion is that 21 is not divisible by 4, and thus the number 21 is not divisible by 4.
No
Is the number 43 divisible by 4?
A number is divisible by another if it divides evenly with no remainder. For example, 20 ÷ 4 = 5 exactly, so 20 is divisible by 4.
Yes! For numbers with more than 2 digits, check if the last two digits are divisible by 4. For 21, we check the whole number since it only has 2 digits.
The decimal .25 shows there's a remainder! When we get 5.25, it means 5 whole groups plus a leftover piece. True divisibility means no leftover pieces.
Use mental math: , and 21 - 20 = 1. Since there's a remainder of 1, 21 is not divisible by 4.
The quotient is how many complete groups you can make (5 in this case). The remainder is what's left over (1 here). For divisibility, the remainder must be 0!
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