# How to Use to a Ruler

## How to Use to a Ruler - How it Works - Video

### Example 1

Example 1:

Here we have a ruler with all the numbers written. Normally they are not. Since we are measuring in cm, we are counting by 0.1. If we take a look at the blue line on the ruler, we can see that the blue line stops at the 1.8 cm mark.

### Example 2

Example 2:

Here we have a ruler with all the numbers written. Normally they are not. Since we are measuring in mm, we are counting by 1. If we take a look at the blue line on the ruler, we can see that the blue line stops at the 23 mm mark.

### Example 3

Example 3:

Here we have a ruler with all the numbers written. Normally they are not. Since we are measuring in cm, we are counting by 0.1. If we take a look at the ruler, we have added the halfway point between 5 and 6, and that is 5.5. The next number after 5.5 is 5.6 and that is where the blue line ends. To convert 5.6 cm to mm we multiply the number by 10 or just move the decimal to the right one spot to get 56 mm.

### Example 4

Example 4:

Here we have a ruler with all the numbers written. Normally they are not. Since we are measuring in cm, we are counting by 0.1. If we take a look at the ruler, we have added the halfway point between 3 and 4, and that is 3.5. The next number after 3.5 is 3.6 and we continue until we reach the end of the blue line, which is 3.8. To convert 3.8 cm to mm we multiply the number by 10 or just move the decimal to the right one spot to get 38 mm.

### Example 5

Example 5:

Here we have a ruler with all the numbers written. Normally they are not. Since we are measuring in mm, we are counting by 1. If we take a look at the ruler, we have added the halfway point between 40 and 50, and that is 45. The next number after 45 is 46 and we continue until we reach the end of the blue line, which is 49. To convert 49 mm to cm we divide the number by 10 or just move the decimal to the left one spot to get 4.9 cm.

### Example 6

Example 6:

Here we have a ruler with all the numbers written. Normally they are not. Since we are measuring in mm, we are counting by 1. If we take a look at the ruler, we have added the halfway point between 40 and 50, and that is 45. Since the blue line is after the 50 mm mark, we will start counting at 50 and then go to 51 until we reach the end of the blue line, which is 52. To convert 52 mm to cm we divide the number by 10 or just move the decimal to the left one spot to get 5.2 cm.

## Live Worksheet

Here is the link if you prefer.