Geared towards 1st and 2nd graders, the Addition Facts to 20 worksheet helps students build rapid recall and mental math fluency for sums up to twenty.

How to Solve Addition

These problems require you to find the sum of two numbers. Try to use mental math strategies, such as 'making ten' (e.g., for 8+5, think 8+2=10, plus 3 more is 13), rather than counting one-by-one.

You can view the preview of this worksheet below, or download the full high-resolution PDF along with the answer key for easy grading.