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GED Math : Basic Operations

Study concepts, example questions & explanations for GED Math

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All GED Math Resources

4 Diagnostic Tests 263 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #255 : Numbers And Operations

Multiply the following numbers: $41\times 84$

Possible Answers:

$\textup{The answer is not given.}$

3344

2444

3444

3434

Correct answer:

3444

Explanation:

Multiply the first number with the ones digit of the second number.

$41\times 4 = 164$

Multiply the first number with the tens digit of the second number.

$41\times 8 = 328$

Add a zero to the end of this number and add it with the first number solved.

3280+164=3444

The answer is: 3444

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Example Question #256 : Numbers And Operations

Multiply: $84\times 9$

Possible Answers:

726

776

626

766

756

Correct answer:

756

Explanation:

Multiply the ones digit of 84 with 9.

$4\times 9 = 36$

Carry over the three, multiply the tens digit of 84 with 9.

$8\times 9 + 3 = 72+3 = 75$

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

The answer is: 756

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Example Question #251 : Numbers And Operations

Multiply: $37\times 13$

Possible Answers:

371

481

491

391

381

Correct answer:

481

Explanation:

Multiply the first number with the ones digit of the second number.

$37\times 3 = 111$

Multiply the first number with the tens digit of the second number.

$37\times 1 = 37$

Add a zero to the end of this number, and add the first number.

370+111 = 481

The answer is: 481

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Example Question #251 : Numbers And Operations

Multiply: $47\times 26$

Possible Answers:

922

1252

1222

1122

872

Correct answer:

1222

Explanation:

Multiply the first number with the ones digit of the second number.

$47\times 6 = 282$

Multiply the first number with the tens digit of the second number.

$47\times 2 = 94$

Add a zero to this number and add the first number.

940+282 = 1222

The answer is: 1222

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Example Question #257 : Numbers And Operations

Multiply the following numbers: $13\times 81$

Possible Answers:

983

1053

153

1043

953

Correct answer:

1053

Explanation:

Multiply the first number with the ones digit of the second number.

$13\times 1 = 13$

Multiply the first number with the tens digit of the second number.

$13\times 8 = 104$

Add a zero to the end of this number and add it with the first number calculated.

1040+13 = 1053

The answer is: 1053

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Example Question #261 : Ged Math

Multiply the following numbers: $54\times 21$

Possible Answers:

1134

1234

162

1062

1034

Correct answer:

1134

Explanation:

Multiply the first number with the ones digit of the second number.

$54\times 1 = 54$

Multiply the first number with the tens digit of the second number.

$54\times 2 = 108$

Add a zero to the end of this number and add the first number.

1080+54 = 1134

The answer is: 1134

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Example Question #262 : Ged Math

Multiply the following numbers: $78\times 52$

Possible Answers:

3946

4146

$\textup{The answer is not given.}$

4056

3956

Correct answer:

4056

Explanation:

Multiply the first digit of 78 with the first digit of 52.

$78\times 2 = 156$

Multiply the first digit of 78 with the second digit of 52.

$78\times 5 = 390$

Add a zero to the end of this number and add it with the first number.

3900+156 = 4056

The answer is: 4056

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Example Question #263 : Ged Math

A sweater that normally costs $\$150$ goes on sale at $15\%$ off for a week. After the first week, the sweater is discounted a further $20\%$ and is sold. How much did the sweater sell for?

Possible Answers:

$\$120$

$\$97.50$

$\$102$

$\$82.50$

Correct answer:

$\$102$

Explanation:

Start by finding the first sale price of the sweater. Since it was $15\%$ off, we can write the following equation to find the first sale price.

$\text{First Sale Price}=150-150(0.15)=127.50$

Now, since the sweater did not sell at this first sale price, another $20\%$ was taken off the price. We can then write the following equation to find the second sale price.

$\text{Second Sale Price}=127.50-127.50(0.2)=102$

Thus, the sweater sold for $\$102$ .

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Example Question #91 : Basic Operations

What is the value of 4x^3+6y^2 when x=4 and y=-8 ?

Possible Answers:

640

768

704

576

Correct answer:

640

Explanation:

Plug in the given values for the and .

4x^3+6y^2=4(4)^3+6(-8)^2

Now, follow the order of operations.

Simplify the exponents first.

4(4)^3+6(-8)^2=4(64)+6(64)

Then simplify the multiplication, then add.

4(64)+6(64)=256+384=640

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Example Question #264 : Ged Math

Solve for $\small z$ : $\small \frac{z}{6}=y-3x$

Possible Answers:

$\small z=6y-18x$

$\small z=y-\frac{1}{2}x$

$\small z=18y-6x$

$\small z=\frac{3y-x}{6}$

$\small z=6y+18x$

Correct answer:

$\small z=6y-18x$

Explanation:

In order to solve for $\small z$ , we need to move all of the variables over to one side.

We can see that our $\small z$ is being divided by $\small 6$ , so in order to move that $\small 6$ we'll need to multiply it on the other side.

$\small \frac{z}{6}=y-3x$

$\small z=(y-3x)6$

$\small z=6y-18x$

Since none of our variables are the same, we cannot proceed any further in this equation.

Our answer is $\small z=6y-18x$

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All GED Math Resources

4 Diagnostic Tests 263 Practice Tests Question of the Day Flashcards Learn by Concept

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GED Math : Basic Operations

Study concepts, example questions & explanations for GED Math

All GED Math Resources

Example Questions

Example Question #255 : Numbers And Operations

Example Question #256 : Numbers And Operations

Example Question #251 : Numbers And Operations

Example Question #251 : Numbers And Operations

Example Question #257 : Numbers And Operations

Example Question #261 : Ged Math

Example Question #262 : Ged Math

Example Question #263 : Ged Math

Example Question #91 : Basic Operations

Example Question #264 : Ged Math

All GED Math Resources

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