Download the Number Grid to 100 below:

## How do we Add or Subtract using the Number Grid?

**one place to the right**, we are

**adding 1**.

**For example**:

If we **start at 14** and move **one place to the right**, we have **added 1**.

**14 + 1 = 15**.

If we begin with a number that is at the **end of a row**, we move to the **beginning of the next row**.

For example:

If we begin with **30**, to **add 1**, we move to the **beginning of the next row**.

**30 + 1 = 31**.

If we choose a number on the number grid and move **one place to the left**, we are **subtracting 1**.

For example:

If we start at **77** and move **one place to the left**, we have **subtracted 1**.

**77 – 1 = 76**.

If we start with a number that is at the **beginning of a row** and **subtract one**, we move to the **end of the previous row**.

For example:

If we begin with **91**, to **subtract 1**, we move to the **end of the previous row**.

**91 – 1 = 90**.