7
+10
5
+10
6
+12
5
+2
2
+1
7
+2
8
+11
5
+3
5
+4
6
+10
4
+5
2
+16
3
+15
1
+17
2
+4
4
+3
5
+4
4
+11
1
+6
10
+4
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.