10
+8
4
+14
3
+6
4
+14
2
+16
2
+11
2
+12
8
+10
1
+15
2
+12
6
+1
10
+7
2
+11
3
+11
6
+10
9
+10
4
+11
10
+5
1
+4
1
+8
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.