Addition & subtraction within 20
Exercises and articles for first-graders — addition and subtraction within 20 with and without crossing the ten, number line, pyramids and chain operations.
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Available exercises
Find the Correct Exercise
Select the correct exercise that matches the result.
Number Chain
Practice step-by-step calculations with number chains.
Addition Pyramid
Use pyramide for improving addition and subtruction skills
Equations with three members
Calculate an equation with three numbers and two operators.