9
+6
8
+7
8
+7
2
+9
8
+2
7
+9
8
+3
5
+6
8
+3
6
+8
3
+9
4
+9
9
+6
4
+7
8
+9
6
+8
8
+3
7
+5
5
+5
7
+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.