6
+2
3
+6
6
+3
10
+7
6
+1
10
+1
1
+12
1
+6
10
+1
3
+15
4
+13
2
+10
5
+14
9
+10
10
+3
3
+10
10
+10
6
+3
1
+11
10
+10
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.