# Addition and subtraction within 100

Contents

Learn to add and subtract two-digit numbers within 100.

See how you score on these 20 practice questions

Adding the same number to itself over and over

Learn how to solve addition problems like 23+4 and 23+40.

Learn how to solve addition problems like 24-3 and 45-30.

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 two-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 word problems that use the words "more" and "fewer". Numbers used are 100 or less.

Learn to count by fives, tens, and hundreds.

Learn how to solve problems like "___ - 37 = 48" where you don't know one of the values in an addition or subtraction equation.