# Rapid Fire Mental Calculation Quiz

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Quizzes Created: 3 | Total Attempts: 7,875
Questions: 10 | Attempts: 7,099  Settings  Are you a pro at mental calculations? With this rapid-fire mental calculation quiz, you can see how well and quickly calculations you can make. This is a quiz that tests your mental calculation. You just need to make a quick calculation and pick the correct answer. Even if you miss out on some questions, we are here to help you with the correct answers. Go for it, and test your knowledge. Do share the quiz with others interested in math or calculations.

• 1.

### 4!+6!=

Explanation
The given expression is the sum of the factorial of 4 and the factorial of 6. The factorial of a number is the product of all positive integers less than or equal to that number. Therefore, 4! is equal to 4 x 3 x 2 x 1 which is 24, and 6! is equal to 6 x 5 x 4 x 3 x 2 x 1 which is 720. Adding these two values together gives us 744.

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• 2.

### 4+6+8+10+12+............................+96=

• A.

5050

• B.

2350

• C.

2650

• D.

3250

B. 2350
Explanation
This is an arithmetic progression with first term =4, common difference =2 and the total number of terms=47.

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• 3.

### If the adjacent and opposite sides of a right angled triangle are 5cm and 12cm respectively, what is the length of the hypotenuse?

• A.

13cm

• B.

13.5cm

• C.

14cm

• D.

14.5cm

A. 13cm
Explanation
In a right-angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides. Using the Pythagorean theorem, we can find the length of the hypotenuse. In this case, the adjacent side is 5cm and the opposite side is 12cm. So, the length of the hypotenuse can be calculated as √(5^2 + 12^2) = √(25 + 144) = √169 = 13cm.

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• 4.

### 35 percent of 560=

• A.

158

• B.

246

• C.

196

• D.

246

C. 196
Explanation
10% of 560 is 56 while 5% of 560 is simply 28 (just divide 56 by 2) ; hence 35%  of 560 is equivalent to 196.

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• 5.

• A.

60

• B.

600

• C.

6

• D.

6000

B. 600
• 6.

### The odd number just before 4001 is

• A.

4000

• B.

4003

• C.

3999

• D.

4002

C. 3999
Explanation
The odd number just before 4001 is 3999 because it is the closest odd number to 4001 that is smaller than it.

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• 7.

### 765/6=

• A.

127

• B.

127.5

• C.

127.64

• D.

127.75

B. 127.5
Explanation
The correct answer is 127.5 because when you divide 765 by 6, you get a quotient of 127.5.

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• 8.

### 583 = 500 + ? + 3

• A.

80

• B.

87

• C.

103

• D.

95

A. 80
Explanation
To find the missing number, we need to subtract 500 and 3 from 583. 583 - 500 - 3 = 80. Therefore, the missing number is 80.

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• 9.

### Which number is 300 more than 5762?

• A.

5062

• B.

5792

• C.

6062

• D.

8762

C. 6062
Explanation
The number that is 300 more than 5762 is 6062. This can be determined by adding 300 to 5762, resulting in 6062.

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• 10.

• A.

6 ÷ 7 = 42

• B.

42 ÷ 7 = 6

• C.

42 - 6 = 7

• D.

6 + 7 = 42