Remember that the number sixty-five is written 65.

**6** is the **tens digit** and **5** is the **units digit.**

When we count up in **2s**, we add two to the previous number.

4 6 8 10 12 14 ...

When we count up in **3s**, we add three to the previous number.

6 9 12 15 18 21 ...

In a list of numbers, the **smallest **is the one we would say **first **when we are counting up.

The **largest **is the one we would say **last**.

In 45, 34, 25, 54, 13

13 is the smallest and 54 is the largest.