Addition Horizontal Within 20
Arithmetic Drill · answer format: Number
addition within 20 worksheets
Addition Within 20 Worksheets and Online Practice
Addition facts become easier when students count on from the larger number or make a ten first.
Skill routine
Add by counting on or making ten
- Start with the larger addend.
- Count on the smaller addend.
- Check whether making ten gives a faster path.
Practice types
What this page can generate next.
Addition Missing Addend Within 20
Arithmetic Drill · answer format: Number
Addition Word Problems Within 20
Word Problem · answer format: Number
Common mistakes
Common addition mistakes
Most addition errors come from counting mistakes, place value confusion, or losing track during regrouping.
Counting the starting number as one
Misaligning tens and ones
Forgetting the regrouped ten
Coverage