What numbers are less than 52 and divisible by 4?

Answer 1

Just recite your 4 times table

4,8,12,16,20,24,28,32,36,40,44,48,52
All of the multiples of 4 up to 48
Divisible by four means that the numbers are a constant multiple of 4:

4n, where n is an integer

There are an infinite amount of numbers less than 52, because the question does not exclude negative numbers. (i.e. -200 is divisible by four, and -200 is less than 52). I'll assume you don't want an infinite answer.

Using 4n, just plug in integers into n:

4(0) = 4 x 0 = 0 <--- 0 is technically divisible by any number, but it's a special case

4(1) = 4 x 1 = 4

4(2) = 8

4(3) = 12

4(4) = 16

...

4(12) = 48

4(13) = 52 <--- you said less than 52, so exclude 52

Excluding negative integers, the answers are:

0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48

Answer 2

0x4 = 0

1x4 = 4

2x4 = 8

etc.

-1x4 = -4

-2x4 = -8

etc.