# Math Help - MEGSSS help?

1. ## MEGSSS help?

I am in 6th grade MEGSSS (advandced math) and I don't really understand tonight's homework. The teacher gave us modulo 7 multiplication. I have no idea what that is. If it helps, the first problem is $5$x $3$ (modulo 7).

2. Just multiply the numbers as you would normally and then figure out the least residue (remainder) modulo 7:
$5 \cdot 3 \equiv 15 \equiv 1 \ (\text{mod }7)$

3. I'm not sure whether in 6th grade you'll know about the meaning of "residue class"
I am in 6th grade MEGSSS (advandced math) and I don't really understand tonight's homework. The teacher gave us modulo 7 multiplication. I have no idea what that is. If it helps, the first problem is $5$x $3$ (modulo 7).
Thus $15 \equiv 1 \bmod 7$
Basically, if $a \equiv b \bmod c$, then c divides a-b.