2
+17
7
+2
10
+1
3
+1
6
+12
3
+10
1
+11
7
+10
10
+1
2
+12
10
+1
9
+10
1
+3
1
+8
5
+12
5
+11
2
+10
2
+10
3
+13
8
+11
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.