1
+13
7
+11
1
+18
1
+5
10
+6
3
+2
5
+2
2
+17
10
+1
3
+1
1
+1
6
+12
10
+2
3
+11
3
+2
10
+10
10
+4
6
+1
10
+8
10
+2
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.