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