When we are counting by s, comes first.

Both and equal . So these two equations equal each other. , , and . Because none of these equations equal , they can’t be equal to .

because the numbers are the same.

When we are counting, comes after .

To solve this problem, we first need to find out how many of Justin's toys will fit on the shelves. If we have shelves, and toys fit on each shelf, we can multiply those two numbers together to find out the total number of toys that will fit. Let's let represent the number of toys that will fit.

Justin has toys, so to find out how many don't fit on the shelves we need to know what is left over, so we subtract. Let's let represent the number of toys left over.

When you add and together you get . does not equal because . does not equal because . does not equal because .

We have squares and triangles. and are the same number, so they are equal to each other.

To solve this problem we can set up a proportion and cross multiply to solve for our unknown.

First we cross multiply.

Then we divide each side by to isolate the .

To subtract we can count backwards. Start at and count back .

To add we count up. Start at and count up .