Mental Math Quiz - Grade 5

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1. If the cost of the three tables is 975, then the cost of 1 table is 325.

Explanation

The given statement is true because if the cost of three tables is 975, dividing this cost by three will give us the cost of one table, which is 325. Therefore, the cost of one table is indeed 325.

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About This Quiz
Mental Math Quiz - Grade 5 - Quiz

This Grade 5 Mental Math Quiz challenges students with problems on basic arithmetic, prime numbers, and simple algebra, enhancing their quick calculation skills.

2. 174   - 38 = _____

Explanation

The correct answer is 136 because when you subtract 38 from 174, you get 136.

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3.  25/38  + 7/38  =  32/68 

Explanation

The given statement is false because the sum of 25/38 and 7/38 is not equal to 32/68. To add fractions, the denominators must be the same. In this case, the denominators are already the same, so we can add the numerators to get 32/38. However, this fraction cannot be simplified to 32/68, so the answer is false.

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4. Match the following
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5. 6/?  =  36/42. What is ?

Explanation

Let’s solve the equation for ?. The equation is:

6/?​=36/42​

We can cross-multiply to solve for ?:

6∗42=36∗?

Solving for ? gives:

?=366∗42​

So, ? equals 7.

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6. 25680 =

Explanation

The given expression represents the number 25680 in expanded form. It breaks down the number into its place values, with 2 ten thousands (20000), fifty six hundreds (5600), and eighty (80). By adding these values together, we get the correct answer of 25680.

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7. The greatest two-digits prime number is

Explanation

A prime number is a natural number greater than 1 that has exactly two distinct positive divisors: 1 and itself. The greatest two-digit prime number is 97. The other options are incorrect because they are either not prime numbers or not the greatest two-digit prime number:

11 is a prime number, but it is not the greatest two-digit prime number.

99 is not a prime number because it is divisible by 3, 9, 11, and 33.

93 is not a prime number because it is divisible by 3 and 31.

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8. 3/4 of 100 is _____ Percent.

Explanation

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9. 160  ÷x = 16. So, what is x?                                       

Explanation

The correct answer is 10. To find the value of x, we need to solve the equation 160 ÷ x = 16. By dividing 160 by 16, we get x = 10.

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10. 5h 15 min after 2:45 pm is _____

Explanation

To find the time 5 hours and 15 minutes after 2:45 PM, follow these steps:

Add 5 hours to 2:45 PM:

2:45 PM + 5 hours = 7:45 PM

Add 15 minutes to 7:45 PM:

7:45 PM + 15 minutes = 8:00 PM

So, 5 hours and 15 minutes after 2:45 PM is 8:00 PM.

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If the cost of the three tables is 975, then the cost of 1 table is...
174   - 38 = _____
 25/38  + 7/38  =  32/68 
Match the following
6/?  =  36/42. What is ?
25680 =
The greatest two-digits prime number is
3/4 of 100 is _____ Percent.
160  ÷x = 16. So, what is x? ...
5h 15 min after 2:45 pm is _____
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