Skill: Skip-count by 3s, 4s, 6s, 8s, and 9s

Skip-counting means adding the same number again and again. The number you add is the skip number.

For example, to skip-count by $6$:

1. Start with the given number.
2. Add $6$ to find the next number.
3. Keep adding $6$.
4. Stop when you reach or pass $(100)$, if the problem says to stay within $(100)$.

Example: Start at $(12)$ and skip-count by $6$ to $(100)$.

Add $6$ each time:

$$12$$ $$12+6=18$$ $$18+6=24$$ $$24+6=30$$

Continue:

$$12,\ 18,\ 24,\ 30,\ 36,\ 42,\ 48,\ 54,\ 60,\ 66,\ 72,\ 78,\ 84,\ 90,\ 96$$

The sequence ends at $(96)$ because adding $6$ one more time gives $(102)$, which is greater than $(100)$.

Each step is $6$, so this also represents equal groups and multiplication facts:

$$6+6+6=18$$

and

$$3\times 6=18.$$

The same method works when skip-counting by $3$, $4$, $8$, or $9$: add that number every time.