GED Math : Numbers and Operations

Study concepts, example questions & explanations for GED Math

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Example Questions

Example Question #11 : Multiplication

Multiply the numbers:  \(\displaystyle 49\times 24\)

Possible Answers:

\(\displaystyle 1176\)

\(\displaystyle 1286\)

\(\displaystyle 1076\)

\(\displaystyle 1166\)

\(\displaystyle 1276\)

Correct answer:

\(\displaystyle 1176\)

Explanation:

Multiply 49 with the ones digit of the second number.

\(\displaystyle 49\times 4 = 196\)

Multiply 49 with the tens digit of the second number.

\(\displaystyle 49\times 2 = 98\)

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

\(\displaystyle 980+196 = 1176\)

The answer is:  \(\displaystyle 1176\)

Example Question #21 : Multiplication

Multiply the numbers:  \(\displaystyle 42\times 37\)

Possible Answers:

\(\displaystyle 1444\)

\(\displaystyle 1454\)

\(\displaystyle 1534\)

\(\displaystyle 1554\)

\(\displaystyle 1354\)

Correct answer:

\(\displaystyle 1554\)

Explanation:

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

\(\displaystyle 42\times 7 = 294\)

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

\(\displaystyle 42\times 3 = 126\)

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

\(\displaystyle 1260+294= 1554\)

The answer is:  \(\displaystyle 1554\)

Example Question #21 : Multiplication

Multiply the numbers:  \(\displaystyle 83\times 21\)

Possible Answers:

\(\displaystyle 1643\)

\(\displaystyle 249\)

\(\displaystyle 1743\)

\(\displaystyle 1843\)

\(\displaystyle 1249\)

Correct answer:

\(\displaystyle 1743\)

Explanation:

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

\(\displaystyle 83\times 1 = 83\)

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

\(\displaystyle 83\times 2 = 166\)

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

\(\displaystyle 1660+83 = 1743\)

The answer is:  \(\displaystyle 1743\)

Example Question #22 : Multiplication

Multiply the following numbers:  \(\displaystyle 23\times 42\)

Possible Answers:

\(\displaystyle 976\)

\(\displaystyle 138\)

\(\displaystyle 936\)

\(\displaystyle 966\)

\(\displaystyle 956\)

Correct answer:

\(\displaystyle 966\)

Explanation:

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

\(\displaystyle 23\times 2=46\)

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

\(\displaystyle 23\times 4=92\)

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

\(\displaystyle 920+46 = 966\)

The answer is:  \(\displaystyle 966\)

Example Question #23 : Multiplication

Multiply the numbers:  \(\displaystyle 32\times 46\)

Possible Answers:

\(\displaystyle 1472\)

\(\displaystyle 1462\)

\(\displaystyle 1372\)

\(\displaystyle 1362\)

\(\displaystyle 1572\)

Correct answer:

\(\displaystyle 1472\)

Explanation:

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

\(\displaystyle 32\times 6 = 192\)

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

\(\displaystyle 32\times 4 = 128\)

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

\(\displaystyle 1280 + 192 = 1472\)

The answer is:  \(\displaystyle 1472\)

Example Question #24 : Multiplication

Multiply the following numbers:  \(\displaystyle 45\times 24\)

Possible Answers:

\(\displaystyle 1070\)

\(\displaystyle 1180\)

\(\displaystyle 980\)

\(\displaystyle 1080\)

\(\displaystyle 970\)

Correct answer:

\(\displaystyle 1080\)

Explanation:

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

\(\displaystyle 45\times 4 = 180\)

Repeat the process with the tens digit of the second number.

\(\displaystyle 45\times 2 = 90\)

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

\(\displaystyle 900+180 = 1080\)

The answer is:  \(\displaystyle 1080\)

Example Question #25 : Multiplication

Multiply the following:  \(\displaystyle 12\times 64\)

Possible Answers:

\(\displaystyle 758\)

\(\displaystyle \textup{The answer is not given.}\)

\(\displaystyle 868\)

\(\displaystyle 668\)

\(\displaystyle 768\)

Correct answer:

\(\displaystyle 768\)

Explanation:

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

\(\displaystyle 12\times 4 = 48\)

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

\(\displaystyle 12\times 6 = 72\)

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

\(\displaystyle 720+48 = 768\)

The answer is:  \(\displaystyle 768\)

Example Question #26 : Multiplication

Multiply the numbers:  \(\displaystyle 235\times 64\)

Possible Answers:

\(\displaystyle 14040\)

\(\displaystyle 23540\)

\(\displaystyle 15040\)

\(\displaystyle 2350\)

\(\displaystyle 23500\)

Correct answer:

\(\displaystyle 15040\)

Explanation:

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

\(\displaystyle 235\times 4 = 940\)

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

\(\displaystyle 235\times 6 = 1410\)

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

\(\displaystyle 14100+940=15040\)

The answer is:  \(\displaystyle 15040\)

Example Question #27 : Multiplication

Multiply the numbers:  \(\displaystyle 23\times 14\)

Possible Answers:

\(\displaystyle 342\)

\(\displaystyle 332\)

\(\displaystyle 322\)

\(\displaystyle 232\)

\(\displaystyle 222\)

Correct answer:

\(\displaystyle 322\)

Explanation:

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

\(\displaystyle 23\times 4 = 92\)

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

\(\displaystyle 23\times 1 = 23\)

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

\(\displaystyle 230+92 = 322\)

The answer is:  \(\displaystyle 322\)

Example Question #28 : Multiplication

Multiply the numbers:  \(\displaystyle 31\times 84\)

Possible Answers:

\(\displaystyle 2614\)

\(\displaystyle 2604\)

\(\displaystyle 2504\)

\(\displaystyle 2514\)

\(\displaystyle 2414\)

Correct answer:

\(\displaystyle 2604\)

Explanation:

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

\(\displaystyle 31\times 4 = 124\)

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

\(\displaystyle 31\times 8= 248\)

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

\(\displaystyle 2480+124 = 2604\)

The answer is:  \(\displaystyle 2604\)

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