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 $\displaystyle 5$x$\displaystyle 3$ (modulo 7).
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 $\displaystyle 5$x$\displaystyle 3$ (modulo 7).
I'm not sure whether in 6th grade you'll know about the meaning of "residue class"
Working modulo 7 means that whatever result you have, you work with the remainder of this result in the Euclidian division by 7.
Since 15=7x2+1, its remainder in the Euclidian division by 7 is 1.
Thus $\displaystyle 15 \equiv 1 \bmod 7$
Basically, if $\displaystyle a \equiv b \bmod c$, then c divides a-b.