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