ISEE Middle Level Math : How to subtract variables
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Example Questions
Example Question #2257 : Isee Middle Level (Grades 7 8) Mathematics Achievement
Subtract the following:
To subtract variables, we will look at the variables like they are objects. So, in the problem
we can think of the variable b as books. So, we can write it like this:
We can read this as: We have borrowed 7 books from the library. We return 4 of those books to the library. How many books do we have left? We have 3 books. So,
We can subtract variables the same way. We get
Example Question #41 : How To Subtract Variables
Simplify the following:
When subtracting variables, we can look at the variables as objects. So, in the problem
we can think of the variable c as crackers. So, we can write the problem like this:
Now, we can read the problem like this: We have a plate with 10 crackers. We go and eat 4 of the crackers. How many crackers are left on the plate? There are 6 crackers. So,
We can subtract variables the same way:
Example Question #41 : How To Subtract Variables
Subtract the following:
When subtracting variables, we can look at the variables like objects. So, in the problem
we can think of the variable b as brownies. So, we can write the problem like this:
We can read it like this: You see there is a plate that contains 10 brownies. You love brownies, so you eat 2 of them. How many brownies are left on the plate? There are 8 brownies left.
We can subtract variables the same way.
Example Question #141 : Operations
Subtract the following:
To subtract variables, we will look at the variables like they are objects. So, in the problem
we can think of the variable c as cookies. So, we can write it like this:
We can read it like this: There is a plate with 10 cookies on it. They smell delicious, so we decide to eat 4 cookies. How many cookies are left on the plate? There are 6 cookies left on the plate.
We can subtract variables the same way:
Example Question #141 : Operations
Simplify:
Begin by distributing the subtraction through the group:
Next, change the double negative to a positive:
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