3
+12
6
+10
3
+11
3
+11
3
+6
6
+3
1
+17
4
+3
10
+1
3
+15
5
+12
10
+5
3
+11
10
+6
3
+2
3
+3
4
+14
5
+10
2
+13
7
+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.