8
+1
1
+16
3
+15
8
+10
10
+3
2
+10
2
+3
2
+4
2
+13
3
+10
2
+12
2
+6
5
+11
1
+6
1
+10
1
+1
8
+11
10
+8
4
+1
2
+14
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.