10
+1
10
+8
2
+4
10
+2
10
+2
3
+11
2
+6
9
+10
2
+2
10
+4
6
+3
8
+10
6
+13
10
+6
9
+10
10
+3
5
+10
2
+14
2
+13
7
+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.