Is the number 15 divisible by 2?
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Is the number 15 divisible by 2?
To determine if the number 15 is divisible by 2, we will apply the rule for divisibility by 2:
Now, let's follow these steps:
Step 1: Identify the last digit of the number 15. The last digit is 5.
Step 2: Compare this digit with the criteria for divisibility by 2. The digit 5 is not in the set of digits {0, 2, 4, 6, 8}.
Since the last digit of 15 is not one of the digits that makes a number divisible by 2, 15 is not divisible by 2.
Therefore, the conclusion is clear: the number 15 is not divisible by 2.
No
Is the number 43 divisible by 4?
A number is divisible by another if you can divide it evenly with no remainder. For example, 8 ÷ 2 = 4 exactly, so 8 is divisible by 2.
You can divide 15 by 2, but you get 7.5 (a decimal). Divisibility means getting a whole number answer only. Since 7.5 isn't whole, 15 is not divisible by 2.
Yes! This is the fastest method. If the last digit is even (0, 2, 4, 6, 8), the whole number is divisible by 2. If it's odd (1, 3, 5, 7, 9), it's not.
It doesn't matter how long the number is! For divisibility by 2, only look at the last digit. Whether it's 15, 1,275, or 98,765 - just check that final digit.
Absolutely! Each number has its own rule: divisibility by 3 uses sum of digits, by 5 uses last digit 0 or 5, by 10 uses last digit 0. Learn these patterns to work faster!
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