7, 5, 12
7 5 12 12
+5 +7 - 7 - 5
--- --- --- ---
12 12 5 7
6, 1, 7
6 1 7 7
+1 +6 -1 -6
--- --- --- ---
7 7 6 1
NOTE:
Explain that it doesn't matter if you write fact families horizontally or
vertically. (You might want to say "side to side" for horizontal and "up and
down" for vertical.) Have the student practice writing a few fact families
using these numbers: (8,1,9), (5,2,7), and (9,2,11).