Add the ones digits.

Carryover the one and add all the tens digits.

Combine this number with the ones digit of the first number.

The answer is:  

Add the ones digits.

Carry over the one, and add the tens digits.

Combine this value with the ones digit of the first number.

The answer is:  

In order to solve for , we need to move the rest of the variables to the other side so that  is by itself.

Currently there are two other variables near ,  and . In order to solve the equation, we will need to move them to the other side with .

Let's start by subtracting  from both sides.

Now let's add  to both sides.

Because there are no numbers and that all of our variables are different we cannot do anything else to this equation. 

Our answer is 

Addition is the combination of two numbers in order to create a bigger number.

Here we have  and  which are being added together, so let's take our  and count  numbers above it in order to see what our new number will be.

, , , , , 

Now that we have counted  numbers above , we can see that our new number, when adding the two together, would be .

Our answer is .

Since we are working with subtraction, that means that our final answer must be smaller than the largest number we're working with. We will take our  and go backwards  times.

, 

If we count down from   times, we have .

Our answer is .

There are a few different ways you can solve this equation.

The first and easiest way is to use a calculator, but we're going to solve this as if we don't have one.

The next option is to simply count  times after , but that would be long and tedious. 

We're going to instead take  and place it atop  in order to solve it. It should look something like this:

So now let's add down by each column individually, starting with the rightmost one. We have , which will equal . Because the number the other two numbers made is more than ten, we will take the  in front of the  and add it to the top of the next column to add from there. It will look something like this:

Now we have three 's which we will add together to make .

Since there are no more columns to add and no hanging numbers, this should be our answer and you should get the same one if you count it or use your calculator.

Our answer is .

Multiply one digit at a time:

The product is 

The commutative property of multiplication states that two numbers can be multiplied in either order to yield the same product. Of the four choices,

demonstrates this. It is the correct choice.

The associative property of multiplication states that when three numbers are multiplied, any two can be multiplied first and the same product will appear. Of the four choices, 

demonstrates this.

The symbols show that two numbers can be multiplied in either order to achieve the same result. This is the commutative property of multiplication.