ISEE Lower Level Quantitative : Algebraic Concepts

Study concepts, example questions & explanations for ISEE Lower Level Quantitative

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Example Questions

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Example Question #1 :How To Find The Solution To An Equation

What is the value of x in the equation?

\dpi{100} \frac{200+50}{5}=x

Possible Answers:

\dpi{100} 25

\dpi{100} 5

\dpi{100} 100

\dpi{100} 50

Correct answer:

\dpi{100} 50

Explanation:

First, add\dpi{100} 200+50=250.

Next, divide\dpi{100} 250\div 5=50.

So\dpi{100} x=50

Example Question #2 :How To Find The Solution To An Equation

Simplify.

Possible Answers:

Correct answer:

Explanation:

When simplifying an expression, you must combine like terms. There are two types of terms in this expression: “x’s” and whole numbers. Combine in two steps:

1) x’s:

2) whole numbers:

The simplified expression is:.

Example Question #3 :How To Find The Solution To An Equation

Solve, when.

Possible Answers:

Correct answer:

Explanation:

To solve, insertfor each:

Simplify:

*Common error: When solving this part of the equation always remember the order of operations (PEMDAS) and square the number in the () BEFORE multiplying!

Example Question #4 :How To Find The Solution To An Equation

Solve for.

Possible Answers:

Correct answer:

Explanation:

Example Question #5 :How To Find The Solution To An Equation

Use the equations to answer the question.

What is?

Possible Answers:

Correct answer:

Explanation:

First, you need to find what would makeandtrue in their respective equations.equals 1 andequals 4. The next step is to add those together, which gives you 5.

Example Question #6 :How To Find The Solution To An Equation

What story best fits the expression?

Possible Answers:

Jonah had 3 baseball cards, but after his friend gave him some, he had 12.

Lisa had 9 pencils with two erasers each.

Michelle had 3 stuffed animals and gave 1 away.

Nell bought 9 bags of candy with 3 pieces of candy in each bag.

Correct answer:

Nell bought 9 bags of candy with 3 pieces of candy in each bag.

Explanation:

Nell's story fits best because if she bought 9 bags with 3 pieces each, that would be 27 total. This fits best with theequation.

Example Question #7 :How To Find The Solution To An Equation

What isequal to in this equation:

Possible Answers:

Correct answer:

Explanation:

Find the number that makes the equation true. 2 works because when plugged in, the left side of the equation becomes 13, making the whole equation true.

Example Question #8 :How To Find The Solution To An Equation

Five more than a number is equal toof twenty-five . What is the number?

Possible Answers:

Correct answer:

Explanation:

From the question, we know thatplus a number equalsof. In order to find out whatofis, multiplyby.

, or.

The number we are looking for needs to be five less than, or.

You can also solve this algebraically by setting up this equation and solving:

Subtractfrom both sides of the equation.

Example Question #9 :How To Find The Solution To An Equation

Solve for.

Possible Answers:

Correct answer:

Explanation:

To solve for, we want to isolate, or get it by itself.

Addto both sides of the equation.

Now we need to divide both sides by the coefficient of, i.e. the number directly in front of the.

Example Question #10 :How To Find The Solution To An Equation

Solve for.

Possible Answers:

Correct answer:

Explanation:

First, subtract the three from both sides:

Then, divide by three on both sides:

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