10
+4
4
+2
3
+14
1
+15
6
+11
5
+3
10
+5
3
+2
3
+15
6
+2
10
+6
6
+13
10
+3
2
+13
3
+2
5
+2
10
+7
3
+14
2
+11
5
+4
Practice addition within 20 with free printable worksheets. Uniquely generated — reinforce key math skills with every set.
Frequently Asked Questions
How do I use this Addition Within 20 Hard Worksheets worksheet?
Print the worksheet and complete the problems. Each set number generates a unique arrangement. Use the same set number for all students in a class for consistent assessment.
Is there an answer key?
Yes — every worksheet includes a complete answer key. Print it separately or view it on screen.