8
+10
2
+10
10
+3
5
+12
10
+7
3
+10
10
+10
4
+11
2
+2
3
+10
1
+17
7
+12
10
+6
3
+13
10
+2
1
+15
5
+1
5
+13
10
+4
4
+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.