Adding and Subtracting with Confidence

Addition means putting numbers together, and subtraction means taking them away. In third grade, you'll add and subtract numbers up to 1,000 using cool strategies.

Mental Math Tricks

Use friendly numbers or break numbers into parts to add or subtract quickly in your head. For example, to add 398 + 7, think "398 + 2 = 400, then add 5 more to get 405!"

Using Place Value

Line up the numbers by their digits and add or subtract hundreds, tens, and ones separately.

Regrouping (Carrying and Borrowing)

When you add or subtract and the ones or tens go over 10, you regroup. This means you carry over or borrow from the next place value.

Everyday Uses

These strategies help you solve problems like counting money, shopping, or keeping score in a game.