Subtraction
39-21=18
Subtraction finds the difference between two numbers. Starting from 39 and taking away 21 leaves 18. Borrow from the tens place when the top ones digit is smaller than the bottom one.
Subtraction
Subtraction finds the difference between two numbers. Starting from 39 and taking away 21 leaves 18. Borrow from the tens place when the top ones digit is smaller than the bottom one.