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