8, 4, 12
8 + 4 = 12
4 + 7 = 12
12 - 4 = 8
12 - 8 = 4
6, 3, 9
6 + 3 = 9
3 + 6 = 9
9 - 3 = 6
9 - 6 = 3
NOTE:
Review fact families with the student. Make a few sets of numbers for the
student two write the four equations for. Have the student practice writing
the fact families both vertically and horizontally.