Yes, 1,260 divided by 2 = 630
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To check if a number is divisible by 4 quickly and easily, you only look at the tens and units. You divide these by 2 and if the result is even, the whole number is divisible by 4. In this case, you take 60, divide it by 2 to get 30, which is even. Thus 1260 is divisible by 4.
Yes.
Yes. The result is 420.
The numbers that are divisible by 420 are infinite. They include: 420, 840, 1260, 1680, 2100, 2520. . .
Suppose the polygon has n sides. Then (n - 2)*180 = 1260 So (n - 2) = 1260/180 = 7 and therefore, n = 7 + 2 = 9