2
+7
1
+15
1
+13
6
+2
10
+6
3
+5
5
+10
6
+1
3
+4
2
+10
7
+11
2
+6
10
+3
10
+4
10
+4
5
+4
4
+3
8
+10
3
+5
7
+2
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.