# Addition and subtraction

Contents

In this topic, we will add and subtract whole numbers. The topic starts with 1+1=2 and goes through adding and subtracting within 1000. We will cover regrouping, borrowing, and word problems.

Try some practice problems

Learn by doing or check your understanding

Adding and subtracting is the basis of all mathematics. This tutorial introduces you to one-digit addition and subtraction.

Learn how to make the number 10 from two smaller numbers.

Learn how to solve addition and subtraction word problems with small numbers. Numbers used are 10 or less.

Add and subtract numbers 20 or less. Find the missing number in addition and subtraction equations.

Learn how to solve addition and subtraction word problems. Numbers used are 20 or less.

Learn how to solve word problems that use the words "more" and "fewer". Numbers used are 20 or less.

Learn how to add two-digit numbers. By the end of this tutorial, you'll be able to solve problems like 48+6 and 48+21. More advanced problems like 48+28 will be covered in a future tutorial.

Learn how to subtract two-digit numbers. By the end of this tutorial, you'll be able to solve problems like 48-9 and 48-31. More advanced problems like 48-29 will be covered in a future tutorial.

Learn strategies for adding and subtracting 2-digit numbers.

Learn to add two-digit numbers like 37 and 49.

Learn to subtract two-digit numbers like 47 and 39.

Learn how to solve addition and subtraction word problems. Numbers used 100 or less.

Learn how to solve addition problems by adding ones, tens, and hundreds.

Learn how to solve addition problems by adding ones, tens, and hundreds.

Learn strategies for solving addition problems within 1000.

Learn how to add numbers like 259 + 363. These addition problems are a harder than the ones we've done before because they require regrouping (also called carrying).

Learn how to subtract numbers like 363 - 259. These subtraction problems are a harder than the ones we've done before because they require regrouping (also called borrowing).

Learn how to solve problems like "___ - 237 = 448" where you don't know one of the values in an addition or subtraction equation.

Learn strategies for adding and subtracting numbers greater than 1000.