Starting at 0 we can count up in 7s like this:
0 7 14 21 28 35 42 49 56 63 70 77 84 ...
We add 7 to the previous number to get the next.
These are the multiples of 7.
Example
When we count up in 7s, what comes after 49?
Answer
Start with a multiple of 9 that you know.
35 42 49 56
Example
When we count up in 7s, what comes before 70?
Answer
List the multiples of 7 near 70.
56 63 70 77 84