Class 4 A Mental Math's Competition

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.

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.

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

There are 8 sixes in 48.

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.

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

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.

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

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

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.

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.

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.

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.

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.

Adding 9 to the number 72 results in 81.

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.

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.

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.

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.

One thousand is equal to 100 tens.

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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.

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.

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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The product of any set of numbers that includes zero is always zero. This is because multiplication is essentially repeated addition. When you multiply a number by zero, you are adding that number to itself zero times, which results in zero.

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.

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.

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.

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.

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.

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.

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.

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