Three digit addition/subtraction

Three-digit addition is the process of adding numbers that have three digits, such as 123 + 456.

Three-digit subtraction is the process of subtracting one three-digit number from another, like 789 - 456.

651 + 219 = 870.

Add the number of students in each class together, like 43 + 57 + 32 + 15 = 147.

90 + 382 = 472.

804 - 188 = 616.

589 - 325 = 264.

Line up the numbers by their place values: hundreds, tens, and ones.

You carry over the extra value to the next column on the left.

Place value is the value of a digit based on its position in a number, such as hundreds, tens, or ones.