2
+15
9
+10
3
+6
1
+6
3
+5
2
+3
10
+3
2
+11
10
+7
9
+10
1
+2
6
+11
3
+16
5
+11
10
+7
1
+15
2
+17
10
+8
3
+16
10
+5
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.