Look at the fact families below, which one is NOT a fact family?
a) -3, 7, & -21
b) 2, -4, & -8
c) -6, -8, & -48
d) -5, -4, & 20
e) -9, 7, & -63
sure looks like C to me
why?
a) -3, 7, & -21
b) 2, -4, & -8
c) -6, -8, & -48
d) -5, -4, & 20
e) -9, 7, & -63
why?