4
+1
6
+10
1
+15
4
+13
2
+4
2
+11
4
+5
3
+2
2
+10
5
+11
4
+3
2
+12
1
+17
6
+10
5
+4
3
+6
3
+14
1
+11
8
+11
9
+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.