5
+3
8
+1
6
+12
6
+1
10
+3
2
+6
7
+12
9
+10
1
+14
4
+13
10
+7
1
+17
2
+12
1
+7
2
+12
10
+9
5
+2
4
+2
6
+10
7
+12
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.