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