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

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

To find the missing piece of an addition problem, you can take the biggest number minus the smallest number. , which means .

Using our problem to make a rectangular array, we know that we are going to use a total of squares, and one dimension of the rectangular array is going to have squares, we'll make that the width. Our answer will be how many squares high the rectangle array is, or the height.

We can start with squares and keep adding on top of the previous until we've used all squares. Our rectangular array is squares high with squares left over, which is our remainder.

When we have a set of something that we are splitting up into groups, we divide. In this case, we are dividing students up into cars. We will let represent the number of cars they will need.

Our answer is with a remainder of . This means that they will have full cars of people, but there are people left over. So they need cars in order for every student to be in a car.

When we have a set of something that we are splitting up into groups, we divide. In this case, we are dividing students up into cars. We will let represent the number of cars they will need.

Our answer is with a remainder of . This means that they will have full cars of people, but there is person left over. So they need cars in order for every student to be in a car.

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

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

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

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