10
+7
1
+12
10
+9
10
+6
4
+4
6
+1
2
+16
8
+10
6
+3
7
+12
1
+10
6
+1
10
+10
1
+18
3
+11
4
+12
3
+14
4
+1
3
+16
2
+3
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.