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2a.

6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, ...
9, 18, 27, 36, 45, 54, 63, 72, 81, ...

Any of them the same? Yes! 18, 36, 54, 72, ...

So, the first two common multiples of 6 and 9 are 18 and 36.

2b

8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, ...
10, 20, 30, 40, 50, 60, 70, 80, 90, ...

Any of them the same? Yes! 40, 80, ...

So, the first two common multiples of 8 and 10 are 40 and 80.

3a

Multiples of 4 are those numbers which leave no remainder when divided by 4.

15 leaves a remainder of 3.
32 leaves no remainder.
60 leaves no remainder.
72 leaves no remainder.
88 leaves no remainder.

Another to see this is to list the first few multiples of 4.

4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, ...

We see that 32, 60, 72 and 88 are in the list.

So, the multiples of 4 are 32, 60, 72 and 88.

3b

Multiples of 8 are those numbers which no leave no remainder when divided by 8.

15 leaves a remainder of 7.
32 leaves no remainder.
60 leaves a remainder of 4.
72 leaves no remainder.
88 leaves no remainder.

So, 32, 72 and 88 are multiples of 8. Also note that 8 has a factor of 2, so all multiples of 8 are also multiples of 2.

So, the common multiples of 2 and 8 are 32, 72 and 88.

4a

7, 14, 21, 28, 35, 42, ...

The fifth number in the list is 35.

So, the fifth multiple of 7 is 35.

This can also be seen by multiplying 7 by 5.

4b

6, 12, 18, 24, 30, 36, 42, 48, ...

The eighth number in the list is 38.

So, the eighth multiple of 6 is 48.

This can also be seen by multiplying 6 by 8.

Tyanks So much....