Subtracting Two Numbers Within 20

Let's find the difference of 5 and 3.

5 – 3 = ?

First, count the total number of turtles.

There are five turtles.
 

Now count the number of turtles which are crossed.

Out of 5 turtles, 3 are crossed.
 

Remaining number of turtles = 2
 

5 – 3 = 2

So, the difference of 5 and 3 is 2.