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