HARD
8th CBSE
IMPORTANT
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If an average mosquito typically weighs around 5 mg and an elephant weighs around 4000 kg, then how many mosquitos does it take to weigh as much as an elephant?

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Important Questions on Exponents and Powers

HARD
8th CBSE
IMPORTANT
The mathematics teacher of class 8 taught a new topic, A perfect cube, which is a number,obtained by multiplying the same integer three times or we can rewrite the expression as a3, where a is a whole number. The teacher bought with her a box which consist of four numbers. One of the numbers is a perfect cube. Help the students to identify the perfect cube.
HARD
8th CBSE
IMPORTANT

In today's class, the Mathematics teacher bought with him a box full of numbers, where the numbers are of the form xy, where 0<x<1. The numbers in the box are x1, x-1, x-2 and x-3. Arrange the numbers in correct order.

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8th CBSE
IMPORTANT
If an average ant weighs2×10-6 kg and there are around 10 quintillion =1017 ants in the world. If a human weighs 50 kg and there are 8,000,000,000 humans, then find the ratio of total weight of humans to the total weight of ants.
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8th CBSE
IMPORTANT
The teacher asked the students, what is the multiplicative inverse of x3? Raj said the answer is x13 whereas Sheetal said the answer as x-3. Who do you think is right? Explain why such an error have happened.
HARD
8th CBSE
IMPORTANT
The number of red blood cells per cubic millimetre of blood is approximately 5.5 million. If the average body contains 5 litres of blood, what is the total number of red blood cells in the body? Write the answer in standard form. (1 litre = 1,00,000 mm3).
HARD
8th CBSE
IMPORTANT

There is an offer for buying a pair of film tickets at the nearest film theatre. If people buy tickets for a pair, then the total cost of the tickets is 20xy, where x and y satisfy 2x=10 and 10y=128. Find the cost of the pair of tickets in .

HARD
8th CBSE
IMPORTANT

In a chart, the masses of four planets of our Solar System are mentioned as given below:

Mercury: 3.3×1023 kg

Venus: 4.87×1024 kg

Earth: 5.97×1024 kg

Mars: 6.4×1023 kg

If the Sun's mass is known to be 1.989×1030 kg, then how many combinations of Mercury, Venus, Earth and Mars can fit into one Sun? (Round off to the nearest whole number)

HARD
8th CBSE
IMPORTANT

The exponent refers to the number of times a number is multiplied by itself. E.g. a×a×a×......×an times=an.

Find 12345678.