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.
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.