Class 4 A Mental Math's Competition

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| By Shifabintetariq
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Shifabintetariq
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Quizzes Created: 1 | Total Attempts: 3,887
Questions: 35 | Attempts: 3,904

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Class 4 A Mental Maths Competition - Quiz

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Questions and Answers
  • 1. 

    What is a greater distance, 10 cm or 10 m?

    Explanation
    The greater distance is 10m because meters are a larger unit of measurement compared to centimeters. Therefore, 10 meters is a greater distance than 10 centimeters.

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  • 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.

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  • 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.

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  • 4. 

    How many tens are equal to one thousand?

    Explanation
    One thousand is equal to 100 tens.

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  • 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.

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  • 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.

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  • 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. 4,5
    Explanation
    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.

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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. 6.9
    Explanation
    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.

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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*4
    Explanation
    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.

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  • 11. 

    What will be 23:40 in 12-hour time?

    Correct Answer
    11:40pm, 11:40 pm
    Explanation
    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.

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  • 12. 

    What is double of 44?

    Correct Answer
    88
    Explanation
    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.

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  • 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 thousand
    Explanation
    The value of the digit 4 in the number 145362 is ten thousand.

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  • 14. 

    Workout 15 + 4 + 6.

    Correct Answer
    25
    Explanation
    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.

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  • 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
    8
    Explanation
    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.

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  • 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. North
    Explanation
    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.

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  • 18. 

    Round 573 to the nearest 100?

    Correct Answer
    600
    Explanation
    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.

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  • 19. 

    How many minutes in three-quarters of an hour?

    Correct Answer
    45 mins, 45mins
    Explanation
    Three-quarters of an hour is equivalent to 45 minutes. Therefore, the correct answer is 45 minutes.

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  • 20. 

    1. 6 + ______ = 23.

    Correct Answer
    17
    Explanation
    The missing number that, when added to 6, equals 23 is 17.

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  • 21. 

    How many wheels on 8 cars?

    Correct Answer
    32
    Explanation
    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.

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  • 22. 

    5 + 7 = _______ x 3

    Correct Answer
    4
    Explanation
    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.

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  • 23. 

    How many quarters are there in a half?

    Correct Answer
    2, two
    Explanation
    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.

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  • 24. 

    How many 6’s are there in 48?

    Correct Answer
    8
    Explanation
    There are 8 sixes in 48.

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  • 25. 

    One pencil crayon weighs 9 g. What is the weight of a box of 8 pencil crayons?

    Correct Answer
    72 g, 72g
    Explanation
    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.

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  • 26. 

    Sam is 10 years old , his father is 23 years older than him. What is Sam's father's age?

    Correct Answer
    33
    Explanation
    Sam's father is 23 years older than Sam, which means his father's age is 10 + 23 = 33 years old.

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  • 27. 

    What is the sum of 25 cars and 45 trucks?

    Correct Answer
    70
    Explanation
    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.

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  • 28. 

    Ann left her school at 1:40 and reached home in 15 minutes. At what time did she reach home?

    Correct Answer
    1:55
    Explanation
    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.

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  • 29. 

    What is the product of 85 and 10?

    Correct Answer
    850
    Explanation
    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.

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  • 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 45mins
    Explanation
    The journey time is 1 hour and 45 minutes.

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  • 31. 

    (7×4) + 6 = _______

    Correct Answer
    34
    Explanation
    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.

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  • 32. 

    Sam weighs 37 kg so what is his weight in grams?

    Correct Answer
    37000g, 37000 g
    Explanation
    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.

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  • 33. 

    What 5 times 9?

    Correct Answer
    45
    Explanation
    The question is asking for the product of 5 and 9. Multiplying 5 by 9 equals 45.

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  • 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 kg
    Explanation
    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.

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  • 35. 

    (6×8) - (2×9) =

    Correct Answer
    30
    Explanation
    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.

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