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