Adding and Subtracting Made Easy

Addition helps us combine things, while subtraction helps us find out how much is left when we take some away.

Adding

To add two numbers, start with the ones, then the tens, then the hundreds. If the sum of the ones is greater than 9, you carry over to the tens.

Subtracting

When subtracting, if the top digit is smaller than the bottom one, you borrow from the next place value.

Word Problems

Addition and subtraction are used in word problems about shopping, saving, sharing, and more.

Strategies

• Use number lines to count up or down.
• Break numbers into parts (like 23 = 20 + 3).
• Check your answer by reversing the operation.