The first number 5 is called subtrahend and 3 is called the minuend.
We need to start counting after 3 till we reach 5.
When we start counting after 3 that is 4,5, hence it takes 2 numbers after 3 to reach 5.
Alternate Method - Using symbols or patterns
Directions: Subtract the following. Write subtraction facts for 1,2,3,4,5,6,7,8,9 and 10