Common Core: 2nd Grade Math

This subject covers foundational math concepts for 2nd graders, including addition, subtraction, and basic problem-solving skills.

Basic Concepts

Addition Strategies

Adding Numbers with Fun Tricks

Addition is putting numbers together to make a bigger number. In 2nd grade, you'll add numbers up to 1,000! There are different tricks to make adding easier.

Breaking Apart Numbers

You can break numbers into parts and add them. For example, to add 47 + 36, think of 47 as 40 + 7 and 36 as 30 + 6. Add the tens (40 + 30 = 70) and the ones (7 + 6 = 13), then put them together (70 + 13 = 83).

Using Number Lines

A number line helps you see how numbers grow as you add. Start at 47, jump 30 to 77, and then 6 more to 83!

Practice Makes Perfect

The more you practice, the faster you'll get at adding numbers in your head.

Why Addition Is Helpful

Addition helps you count objects, keep score in games, and solve math puzzles.

Examples

  • 28 + 15 = 43 by adding tens (20 + 10 = 30) and ones (8 + 5 = 13), then 30 + 13 = 43.

  • Using a number line to add 12 + 9 by starting at 12 and moving 9 spaces forward.

In a Nutshell

Addition joins numbers together and can be solved in many clever ways.

Key Terms

Sum
The answer to an addition problem.
Number Line
A line with numbers in order used to help add and subtract.