Can You Ace This Mental Multiplication Quiz?

EDUCATION

Talin Vartanian

5 Min Quiz

Image: Wavebreakmedia Ltd/Wavebreak Media / Getty Images Plus/Getty Images

About This Quiz

Calling all math-lovers out there: If you love to multiply numbers for fun, you'll have a blast trying to multiply the numbers in this quiz together! Some questions are pretty easy, like 7 times 11 (which is 77) while others require you to know how to multiply square roots, squared and cubed numbers, and decimals together.

Let's warm up with a few practice problems. Try and guess what 10 times 5 is. The answer should come to you pretty quickly: 50! Now how about 10 times -2? Since we're multiplying one negative number and one positive number together, the answer will always be negative. So in this case, -20 is the right answer.

Now let's try to multiply square roots together. Before multiplying square roots, it's important to take the actual square root of a number first. For example, let's try and figure out what √25 times √1 is. Well, the square root of 25 is 5, since 5 times 5 is 25. The square root of 1 is 1 because 1 times 1 is 1. So, the problem becomes 25 times 1, which is 25!

Now that you've seen some warm-ups, we think you're ready to ace this mental multiplication quiz! Good luck!

Do you think you know what 7 times 7 is?

When you multiply 7 times 7, you get 49. This means that the square root of 49 is also 7.

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What do you get when you multiply 5 and 6 together?

When you multiply 5 and 6 together, you get 30. As the hint implied, 20 + 10 is also 30.

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What is 0 times 10?

The answer is 0. When you multiply anything by 0, the answer is 0.

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What is 1 times 20?

20 is the right answer. When you multiply any number, like 20, 5, or 10 by 1, the answer is still 20, 5, or 10.

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What number do you get when you multiply 3 and 11 together?

The answer is 33. Another example is 11 times 4 is 44, and 11 times 5 is 55.

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Can you guess what 10 times 10 is?

When you multiply 10 and 10 together, you get 100. This means that the square root of 100 is 10.

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What happens if you multiply -1 and 1 together?

-1 is the right answer. When you multiply a positive and a negative number together, the answer is always negative.

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Try and guess what -2 times -2 is!

2 + 2 is 4 and -2 times -2 is also four. When you multiply two negative numbers together, the answer is always positive.

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What is 5 times 5 times 5?

125 is the right answer. Another way to rewrite this is 5(5)(5) or 25(5).

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What is 3 times 2 times 1?

6 is the correct answer. Another way to rewrite this is 3(2)(1). 3(2) is 6 and 6(1) is 6.

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Can you figure out what 10 times .50 is?

5 is the correct answer. When you multiply a number by .5, you're just cutting that number in half.

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What is 3 times -3 times 3?

-27 is the right answer. Look at the problem like this: 3(-3)(3), which is -9(3) which is -27.

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What happens if you multiply 24 by .25?

6 is the correct answer. When you multiply 24 by .25, you're just separating that number into fourths, or quarters. In other words, 6(4) is 24, which is the same thing as 24 times .25.

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Try and guess what .50 times .50 is!

1/4 or .25 is the right answer. When you multiply .50 and .50 together, you get a smaller number, which is .25.

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What is 25 times 2?

50 is the right answer. When you multiply a number by 2, you're just doubling that number.

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Can you figure out what .75 times 100 is?

The answer is 75. When you multiply a decimal by 100, you're just moving that decimal to the right two times.

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What is 1000 times .15?

The answer is 150. When you multiply a decimal by 1000, all you have to do is move the decimal over to the right three times, hence .15 becomes 150.

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What is -2 times -4 times -10?

-80 is the right answer. When you multiply three negative numbers together, the answer is always negative.

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What is √25 times √9?

The answer is 15. Here's why: the square root of 25 is 5 and the square root of 9 is 3. 5 times 3 is 15.

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What do you get when you multiply √9, √16 and √4 together?

The right answer is 24. The square root of 9 is 3, the square root of 16 is 4 and the square root of 4 is 2. 3 times 4 times 2 is 24.

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What is -√4 times -√4?

The correct answer is 4. -√4 is -2, since the square root of 4 is 2, but there is a negative sign in front, so it becomes -2. -2 times -2 is 4.

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Can you guess what √1 times √0 is?

The answer is 0. √1 is 1 and √0 is 0, so 1 times 0 is 0.

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What is (2²) times (3²)?

36 is the right answer. 2² is 4 and 3² is 9, so 4 times 9 is 36.

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Do you think you know what 3³ times 1³ is?

27 is the right answer. 3³ is 27 since it's basically 3(3)(3). 1³ is 1, so 27 times 1 is 27.

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What is -5 times (5²)?

-125 is the right answer. 5² is 25, so 25 times -5 is -125.

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Multiply these numbers together: √4, -4 and (2²).

If you guessed -32, you're right! √4 is 2 and (2²) is 4, so the problem is just 2 times -4 times 4, which is -32.

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What is 20 times -.25?

-5 is correct. Multiplying a number by .25 is just quartering that number, so when you quarter 20, you get 5. But since .25 is negative, it becomes -5.

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Can you figure out what √100 times .50 is?

The right answer is 5. √100 is 10 and 10 times .50 is 5.

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What is -√25 times -1?

The answer is 5. -√25 is -5 because the square root of 25 is 5, but since there is a negative sign in front, it becomes -5. -5 times -1 is 5.

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What is 50% times 100?

50 is the right answer. 50% can be rewritten as .50, and .50 times 100 is 50 (it's just half of 100).

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Can you guess what 10% times √36 is?

The answer is .60. While the problem looks tricky, just break it down step by step. √36 is 6, since 6 times 6 is 36. 10% can be rewritten as .10, so now the problem is .10 times 6, which is .6. You're just moving the invisible decimal place in front of the 6 to the left once.

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What is 10 times 10 times 10?

1000 is the right answer. 10 times 10 is 100 and 100 times 10 is 1000.

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What happens if you multiply 6 and -10 together?

-60 is the right answer. When you multiply a positive number and a negative number together, you get a negative number.

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Try and guess what 10 times 5 is!

50 is the right answer. 10 times 5 is 50, which means 50/10 is 5 and 50/5 is 10.

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What do you think 7 times 11 is?

77 is the right answer. 11 times 7 is 77, just like how 6 times 11 is 66 and 5 times 11 is 55.

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