What fact is missing from this fact family?
21 + 64 = 85
85 − 64 = 21
64 + 21 = 85
85 − 64 = 21
64 + 21 = 85
ref_doc_title.
Jumping to level 1 of 1
Excellent!
Now entering the Challenge Zone—are you ready?
Now entering the Challenge Zone—are you ready?