# Key Stage 3 Mental Arithmetic Test

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| By 27roguntimehin
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27roguntimehin
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Quizzes Created: 1 | Total Attempts: 1,144
Questions: 12 | Attempts: 1,144

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Mental Maths Test

• 1.

### Y x y x y x y =

• A.

4y

• B.

Y to the power of 4

• C.

Yyyy

• D.

1

B. Y to the power of 4
Explanation
The given expression is a sequence of y and x repeated multiple times. The pattern suggests that every y is multiplied by x, resulting in the next y. This process is repeated four times, so the final expression is y to the power of 4.

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• 2.

### 7a + 2b + 3a + 5b =

• A.

17ab

• B.

10a + 7b

• C.

9ab + 8ab

• D.

9a + 8a

B. 10a + 7b
Explanation
The given equation is 7a + 2b + 3a + 5b. We can combine like terms by adding the coefficients of the same variables. So, combining the coefficients of 'a', we get 7a + 3a = 10a. Similarly, combining the coefficients of 'b', we get 2b + 5b = 7b. Therefore, the simplified form of the equation is 10a + 7b, which matches the given answer.

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• 3.

### What Is 0.2 x 0.3?

• A.

0.05

• B.

0.5

• C.

0.6

• D.

0.06

D. 0.06
Explanation
The correct answer is 0.06 because when you multiply 0.2 by 0.3, you get the product of 0.06.

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• 4.

• 5.

### 0.2 + 0.5 + ... =

0.3
3/10
Explanation
The sum of the series 0.2 + 0.5 + ... is equal to 0.3 or 3/10. This can be determined by recognizing that each term in the series is increasing by 0.3, and the sum of an infinite geometric series can be calculated using the formula S = a / (1 - r), where a is the first term and r is the common ratio. In this case, a = 0.2 and r = 0.5. Plugging these values into the formula gives S = 0.2 / (1 - 0.5) = 0.2 / 0.5 = 0.4. Therefore, the sum of the series is 0.4, which is equal to 0.3 or 3/10.

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• 6.

### - 170 + 19 =

-151
Negative one hundred and fifty one
Minus One Hundred And Fifty One
Explanation
The given equation is 170 + 19. When we add 170 and 19 together, we get a sum of 189. However, the given answer is -151, which is incorrect. The correct answer should be 189.

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• 7.

### 2f + f = 30What Does f Equal To ?

• A.

8

• B.

10

• C.

0.1

• D.

11

B. 10
Explanation
In the given equation, 2f + f = 30, we need to find the value of f. Combining like terms, we get 3f = 30. Dividing both sides by 3, we find that f = 10.

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• 8.

### If 48 x 72 = 3456What Is 24 x 72 ?

• A.

1223

• B.

864

• C.

1728

• D.

3456

C. 1728
Explanation
The given equation states that 48 multiplied by 72 equals 3456. To find the product of 24 multiplied by 72, we can observe that 24 is half of 48. Therefore, the product will also be half of 3456. Half of 3456 is 1728.

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• 9.

### Estimate What 59.8 divided by 2.99

• A.

20

• B.

30

• C.

25

• D.

35

A. 20
Explanation
To estimate 59.8 divided by 2.99, we can round both numbers to the nearest whole number. 59.8 rounds to 60, and 2.99 rounds to 3. Dividing 60 by 3 gives us 20. Therefore, the estimated answer is 20.

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• 10.

### 36 : 9 Simlify This Down To It's Simpliest Form

• A.

4

• B.

4 : 1

• C.

4 : 3

• D.

12 : 3

B. 4 : 1
Explanation
The given expression "36 : 9" can be simplified by dividing both numbers by their greatest common divisor, which is 9. Therefore, "36 : 9" simplifies to "4 : 1".

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• 11.

### 13kdIf k = 3 and d = 2Then What does 13kd equal?

78
Explanation
The expression 13kd can be simplified by substituting the given values of k and d. Since k = 3 and d = 2, we can rewrite 13kd as 13(3)(2). Multiplying these values together gives us 78, which is the final result.

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• 12.

### Write 1/8 as a Decimal

0.125
Explanation
To convert a fraction to a decimal, we divide the numerator (1) by the denominator (8). In this case, 1 divided by 8 equals 0.125. Therefore, the decimal representation of 1/8 is 0.125.

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• Current Version
• Mar 19, 2023
Quiz Edited by
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• Apr 06, 2010
Quiz Created by
27roguntimehin

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