6
+3
2
+11
9
+10
9
+10
10
+6
1
+2
5
+4
1
+6
7
+2
4
+13
3
+14
3
+10
1
+6
3
+16
6
+13
1
+12
2
+5
3
+5
2
+6
3
+3
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.