6
+1
2
+10
10
+2
6
+3
2
+17
7
+12
8
+11
8
+1
6
+11
10
+7
10
+1
10
+7
10
+6
6
+13
5
+3
3
+15
1
+15
7
+11
2
+5
4
+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.