Skill: Identify patterns when subtracting 10

Subtracting $10$ means taking away one group of ten.

When you subtract $10$:

• The tens digit goes down by 1.
• The ones digit stays the same.

Example: $76-10$

1. In $76$, there are $7$ tens and $6$ ones.
2. Take away $1$ ten: $7$ tens becomes $6$ tens.
3. The $6$ ones stay the same.

So,

$$76-10=66$$

On a number line, start at $76$ and move back one group of ten to land on $66$. You can see the pattern:

$$76,\ 66,\ 56$$

Each number is $10$ less than the one before it, while the ones digit remains $6$.