Class 4 A Mental Math's Competition
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Questions and Answers
- 1.
What is a greater distance, 10 cm or 10 m?
Explanation
The metric system uses prefixes to indicate different scales of measurement. "Centi" (cm) means one hundredth, while "meter" (m) is the base unit of length. Therefore, 10 cm is equal to 0.1 meters. This means that 10 meters is a much greater distance than 10 centimeters.Rate this question:
- 2.
If you add 9 to this number, you get 81. What’s the number?
Explanation
Adding 9 to the number 72 results in 81.Rate this question:
- 3.
You walk into a room with a match. In the room, there is a stove, a heater, and a candle. What do you light first?
Explanation
The correct answer is to light the match first. This is because a match is needed to ignite both the stove and the candle. The heater does not require a match to be lit as it is typically powered by electricity or gas. Therefore, the match is the logical item to light first in order to proceed with lighting the other objects in the room.Rate this question:
- 4.
How many tens are equal to one thousand?
Explanation
One thousand is equal to 100 tens.Rate this question:
- 5.
If you multiply this number by any other number, the answer will always be the same. What number is this?
Explanation
When you multiply any number by 0, the product will always be 0. This is because any number multiplied by 0 equals 0. Therefore, 0 is the only number that satisfies the condition mentioned in the question, making it the correct answer.Rate this question:
- 6.
What is 1/3 of 21?
Explanation
To find 1/3 of 21, we can divide 21 by 3. When we divide 21 by 3, we get a quotient of 7. Therefore, 1/3 of 21 is equal to 7.Rate this question:
- 7.
Write down two numbers with a sum of 9 and a difference of 1.
- A.
7,8
- B.
11,12
- C.
4,5
- D.
2,3
Correct Answer
C. 4,5Explanation
The two numbers that have a sum of 9 and a difference of 1 are 4 and 5. When you add 4 and 5, you get 9. And when you subtract 4 from 5, you get 1. Therefore, the numbers 4 and 5 satisfy the given conditions.Rate this question:
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- 8.
How can you add eight 4’s together so that the total adds up to 500?
- A.
4+4+4+4+4+4+4+4
- B.
4+4+4+44+444
- C.
44+44+44+44
- D.
4+44+444+44
Correct Answer
B. 4+4+4+44+444 -
- 9.
What can you put between 6 and 9, so that the result is greater than a 6 and smaller than 9? [Hint: Use any mathematical symbol]
- A.
6+9
- B.
6x9
- C.
6.9
- D.
6/9
Correct Answer
C. 6.9Explanation
By inserting a decimal point between 6 and 9, the resulting number becomes 6.9. This number is greater than 6 but smaller than 9.Rate this question:
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- 10.
Change this into a multiplication problem? 5+5+5+5=20
Correct Answer
5x4, 5 * 4, 5 x 4, 5*4Explanation
The given equation can be changed into a multiplication problem by multiplying 5 by 4. This can be represented as 5x4, 5 * 4, 5 x 4, or 5*4.Rate this question:
- 11.
What will be 23:40 in 12-hour time?
Correct Answer
11:40pm, 11:40 pm, 11:40 PM, 11:40Explanation
The given question asks for the 12-hour time equivalent of 23:40. In the 12-hour time format, the hours range from 1 to 12, so any time after 12:00 is converted by subtracting 12 hours. Therefore, 23:40 is equivalent to 11:40pm in the 12-hour time format.Rate this question:
- 12.
What is double of 44?
Correct Answer
88Explanation
The question asks for the double of 44, which means multiplying 44 by 2. When we multiply 44 by 2, we get the answer 88. Therefore, the correct answer is 88.Rate this question:
- 13.
What is the value of the digit 4 in the number 145362?
- A.
Ones
- B.
Million
- C.
Ten thousand
- D.
Thousand
Correct Answer
C. Ten thousandExplanation
The value of the digit 4 in the number 145362 is ten thousand.Rate this question:
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- 14.
Workout 15 + 4 + 6.
Correct Answer
25Explanation
The given expression "15 + 4 + 6" is a simple addition problem. Adding 15, 4, and 6 together gives a sum of 25. Therefore, the answer is 25.Rate this question:
- 15.
How can you add eight 8’s to get the number 1000? [Hint: Use only addition]
- A.
8+88+88+88+88+88+88
- B.
8+8+8+88+888
- C.
8+8+8+8+8+8+8+8
- D.
8888+8888
Correct Answer
B. 8+8+8+88+888 -
- 16.
How many groups of 7 make 56?
Correct Answer
8Explanation
To find out how many groups of 7 make 56, we divide 56 by 7. The quotient is the number of groups. In this case, 56 divided by 7 equals 8. Therefore, there are 8 groups of 7 that make 56.Rate this question:
- 17.
I am facing north. I turn 2 half turns which way am I facing now?
- A.
East
- B.
West
- C.
North
- D.
South
Correct Answer
C. NorthExplanation
If you are facing north and you turn 2 half turns, it means you have made a complete turn of 360 degrees. Therefore, you would still be facing north after these turns.Rate this question:
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- 18.
Round 573 to the nearest 100?
Correct Answer
600Explanation
To round a number to the nearest 100, we look at the digit in the tens place. If it is 5 or greater, we round up by increasing the digit in the hundreds place by 1. In this case, the digit in the tens place is 7, which is greater than 5. Therefore, we round up to the nearest 100, which is 600.Rate this question:
- 19.
How many minutes in three-quarters of an hour?
Correct Answer
45 mins, 45minsExplanation
Three-quarters of an hour is equivalent to 45 minutes. Therefore, the correct answer is 45 minutes.Rate this question:
- 20.
- 6 + ______ = 23.
Correct Answer
17Explanation
The missing number that, when added to 6, equals 23 is 17.Rate this question:
- 21.
How many wheels on 8 cars?
Correct Answer
32Explanation
The question asks for the total number of wheels on 8 cars. Since each car typically has 4 wheels, we can calculate the total number of wheels by multiplying the number of cars (8) by the number of wheels per car (4). Therefore, the correct answer is 32.Rate this question:
- 22.
5 + 7 = _______ x 3
Correct Answer
4Explanation
The equation is asking us to find the value that, when multiplied by 3, equals the sum of 5 and 7. To solve for this value, we can start by finding the sum of 5 and 7, which is 12. Then, we divide 12 by 3 to find the missing value, which is 4.Rate this question:
- 23.
How many quarters are there in a half?
Correct Answer
2, twoExplanation
There are two quarters in a half because a quarter represents one-fourth of a whole, and a half represents two-fourths of a whole. Therefore, two quarters make up a half.Rate this question:
- 24.
How many 6’s are there in 48?
Correct Answer
8Explanation
There are 8 sixes in 48.Rate this question:
- 25.
One pencil crayon weighs 9 g. What is the weight of a box of 8 pencil crayons?
Correct Answer
72 g, 72gExplanation
The weight of one pencil crayon is given as 9g. Since there are 8 pencil crayons in the box, we can calculate the total weight by multiplying 9g by 8. This gives us a total weight of 72g. Therefore, the weight of a box of 8 pencil crayons is 72g.Rate this question:
- 26.
Sam is 10 years old , his father is 23 years older than him. What is Sam's father's age?
Correct Answer
33Explanation
Sam's father is 23 years older than Sam, which means his father's age is 10 + 23 = 33 years old.Rate this question:
- 27.
What is the sum of 25 cars and 45 trucks?
Correct Answer
70Explanation
The sum of 25 cars and 45 trucks is 70. This means that if you add the number of cars and trucks together, the total will be 70.Rate this question:
- 28.
Ann left her school at 1:40 and reached home in 15 minutes. At what time did she reach home?
Correct Answer
1:55Explanation
Ann left her school at 1:40 and took 15 minutes to reach home. Therefore, if we add 15 minutes to 1:40, we get the time when she reached home, which is 1:55.Rate this question:
- 29.
What is the product of 85 and 10?
Correct Answer
850Explanation
The product of 85 and 10 is 850. To find the product, we multiply the two numbers together. In this case, multiplying 85 by 10 gives us a result of 850.Rate this question:
- 30.
A plane left at 8:00 and reached at 9:45. What is the journey time?
Correct Answer
1:45, 1h 45mins, 1 h 45 mins, 1h 45 mins, 1 h 45minsExplanation
The journey time is 1 hour and 45 minutes.Rate this question:
- 31.
(7×4) + 6 = _______
Correct Answer
34Explanation
The given equation is (7×4) + 6. We need to solve this equation. First, we perform the multiplication operation, which gives us 28. Then, we add 6 to 28, resulting in 34. Therefore, the correct answer is 34.Rate this question:
- 32.
Sam weighs 37 kg so what is his weight in grams?
Correct Answer
37000g, 37000 gExplanation
Sam weighs 37 kg, and since there are 1000 grams in 1 kilogram, his weight in grams would be 37,000 grams. Therefore, the correct answer is 37000g, 37000 g.Rate this question:
- 33.
What 5 times 9?
Correct Answer
45Explanation
The question is asking for the product of 5 and 9. Multiplying 5 by 9 equals 45.Rate this question:
- 34.
Ali is 15 kg heavier than his sister and his sister's weight is 12 kg. What is his weight?
Correct Answer
27kg, 27 kgExplanation
Since Ali is 15 kg heavier than his sister, we can add 15 kg to his sister's weight of 12 kg to find Ali's weight. Therefore, Ali's weight is 27 kg.Rate this question:
- 35.
(6×8) - (2×9) =
Correct Answer
30Explanation
The given equation is (6×8) - (2×9). Using the order of operations, we first calculate the products inside the parentheses: 6×8 = 48 and 2×9 = 18. Then, we subtract the second product from the first: 48 - 18 = 30. Therefore, the answer to the equation is 30.Rate this question:
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