2nd Grade Math

Building on first grade foundations with addition, subtraction, and early problem-solving skills.

Understanding AdditionUnderstanding SubtractionWord Problems and Problem-Solving
Adding and Subtracting Two-Digit NumbersSolving Problems with More Than One StepUsing Number Lines and Tools
Math at the Grocery StoreMath at HomeMath with Friends and Games
Using Pictures and DrawingsCheck Your WorkCounting On and Counting Back
Understanding Additi...Understanding Subtra...Word Problems and Pr...Adding and Subtracti...Solving Problems wit...Using Number Lines a...Math at the Grocery ...Math at HomeMath with Friends an...Using Pictures and D...Check Your WorkCounting On and Coun...
Advanced Topics

Adding and Subtracting Two-Digit Numbers

Working with Bigger Numbers

In second grade, you start adding and subtracting numbers with two digits, like 23 or 45.

Tens and Ones

Each number has a tens place and a ones place. When you add or subtract, it's important to line up the numbers correctly.

Steps

  • Add or subtract the ones first.
  • Then add or subtract the tens.
  • If the ones add up to 10 or more, you carry over to the tens.

Real-Life Connections

Two-digit math helps you with shopping, counting money, or keeping score in games.

Key Formula

\[23 + 18 = 41\]

Examples

  • 25 + 17 = 42

  • 54 - 23 = 31

In a Nutshell

Two-digit numbers can be added or subtracted by working with tens and ones.

Key Terms

Place Value
The value of a digit depending on its position (ones, tens, hundreds).
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Solving Problems with More Than One Step