6
+9
9
+9
8
+9
5
+5
6
+4
9
+8
9
+6
4
+6
7
+9
9
+2
9
+7
5
+6
6
+7
6
+5
6
+7
5
+8
9
+1
9
+7
8
+2
9
+4
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.