6
+10
10
+3
10
+8
5
+1
3
+3
6
+10
1
+13
4
+13
10
+10
1
+11
2
+6
2
+13
5
+11
10
+6
1
+4
1
+3
3
+1
2
+4
10
+5
5
+1
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.