2
+11
4
+2
1
+15
2
+11
2
+1
2
+14
5
+2
6
+13
10
+10
5
+11
2
+4
1
+1
5
+14
10
+7
3
+12
8
+1
6
+11
2
+17
3
+4
2
+1
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.