Even in nature, solving story problems is important. How many apples will be left on a tree if seven are picked?

Use this number line as a tool to practice adding and subtracting within 20.

Help the frog catch the fly! This entertaining math game will have you students practice adding and subtracting within 20 on a number line.

Kids solve addition and subtraction problems with one- and two-digit numbers to crack the code and find the mystery word on this first grade math worksheet.