GED Math : GED Math

Study concepts, example questions & explanations for GED Math

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Example Questions

Example Question #31 : Types Of Numbers And Number Theory

Is the following number:

divisible by three or by four?

Possible Answers:

Three but not four

Both three and four

Neither three nor four

Four but not three

Correct answer:

Four but not three

Explanation:

While this problem can be answered by straight division, an easier method of doing so would be to apply the division tests for 3 and 4.

An integer is divisible by 3 if and only if the sum of its digits is divisible by 3. The digit sum of the number is 

The digit sum is not divisible by 3. It follows that 176,176,176,176 is not divisible by 3.

An integer is divisible by 4 if and only if the integer formed by its final two digits is divisible by 4. This integer is 76, and

.

The two-digit integer is divisible by 4. It follows that 176,176,176,176 is not divisible by 4.

Example Question #31 : Numbers

Give the Arabic number equivalent for the Roman numeral:

Possible Answers:

Correct answer:

Explanation:

The Roman numeral can be broken down as follows:

:

:

; since the smaller-valued symbol precedes the greater-valued symbol, this is a subtraction, so .

:

Add these: , the correct response.

 

Example Question #31 : Ged Math

Which of the following numbers is an integer?

Possible Answers:

Correct answer:

Explanation:

Which of the following numbers is an integer?

An integer is any positive or negative whole number, including 0. 

 is the ratio of circumference to diameter, and is a never ending decimal

  and is known as an imaginary number.

-46.4 is a decimal, and thus not an integer.

Therefore our only integer here is 0

Example Question #31 : Numbers

What sort of solutions are found when  is solved?

Possible Answers:

 real, rational solutions

No real solutions

 real, irrational solutions

 real, irrational solution

Correct answer:

 real, irrational solutions

Explanation:

Look at the discriminant to figure out the number of solutions.

For this equation, 

Since the discriminant is positive, this means that there will be  real solutions. Since the discriminant is not a square of another number, this means that those two solutions will be irrational.

Example Question #31 : Numbers

Sarah says 3 is a rational number. Tom disagrees and says 3 is an integer. Who is right? 

Possible Answers:

Sarah

Both

42

Tom

Neither

Correct answer:

Both

Explanation:

They are both correct.

3 is most certainly an integer as integers are our positive and negative whole numbers.

Sarah is right too. Rational numbers are any number that can be written as a fraction of integers. 3 can be written as a fraction , so it is a rational number too.

In fact, all integers are rational (but not all rational numbers are integers)

Example Question #32 : Ged Math

 is the midpoint of  is the midpoint of  is the midpoint of 

What fraction of  is  ?

Possible Answers:

Correct answer:

Explanation:

Try thinking of  as a number line with endpoint  at 0, and endpoint  at 8. , the midpoint of , would be at 4. , the midpoint of , would be at 2; , the midpoint of  - whose endpoints are at 2 and 8 - would be at 5. 

 is  of .

Example Question #31 : Ged Math

 is the midpoint of  is the midpoint of  is the midpoint of 

What percent of  is  ?

Possible Answers:

Correct answer:

Explanation:

Try thinking of  as a number line with endpoint  at 0, and endpoint  at 8. , the midpoint of , would be at 4. , the midpoint of , would be at 2; , the midpoint of  - whose endpoints are at 2 and 8 - would be at 5. 

Therefore, 

 is  of 

Example Question #1 : Number Lines

Numberline

Refer to the above number line. Which of the points is most likely the location of   ?

Possible Answers:

Correct answer:

Explanation:

Convert  to a decimal by dividing 5 by 9.

Division

, so it falls between 0.55 and 0.56 on the number line. Point  is the correct response.

Example Question #1 : Number Lines

Numberline

Refer to the above number line. Which of the points is most likely the location of the number  ?

Do not use a calculator.

Possible Answers:

Correct answer:

Explanation:

, so

Point  is in this range, so this is the correct response.

Example Question #1 : Number Lines

Numberline

Refer to the above number line. Which of the points is most likely the location of the product of 2 and  ?

Do not use a calculator.

Possible Answers:

Correct answer:

Explanation:

, so

Point  falls between 6.2 and 6.3 on the number line, so this is the correct choice.

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