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Earn 100

A student of 5th standard started writing down the counting numbers as 1, 2, 3, 4,… and then he added all those numbers and got the result 500. But when I checked the result I have found that he had missed a number. What is the missing number?

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Important Questions on Number System

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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 38
A stairway of 20 ft height is such that each step accounts for half a foot upward and one foot forward. What distance will an ant travel if it starts from ground level to reach the top of the stairway?
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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 39
Paltry and Sundry, the two bird hunters went to woods. Paltry fires 5 shots when Sundry fires 7 shots. But Paltry kills 2 out of 5 while Sundry kills 3 out of 7. When Sundry has missed 32 shots, then how many birds has Paltry killed?
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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 40
A cigarette pack is 56th full of its capacity, then 5 cigarettes were taken out and 2 another cigarettes were put inside the pack. Now it is 45 full. How many cigarettes can this pack contain when it is full?
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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 41
Around a square table chairs are arranged in a sequence starting from one corner, numbered as 1, 2, 3,… etc. The chair number 2 is opposite the chair number 14. How many chairs are there in all?
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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 42
The value of y for which the expression p=1(|y-1|-3) becomes undefined:
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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 43

What is the sum of the following series?

11×2+12×3+13×4+…+1100×101

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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 44
If Rupert has 4 more coins than Laxmi, Laxmi has 1 more coin than Bill and Bill has 1 more coin than Hawkins. Finally Hawkins has 4 more coins than Ajim. Then minimum number of coins that must be transfered if all of them wish to have an equal number of coins:
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Quantum CAT Also Useful for XAT>Chapter 1 - SNAP>CMAT>Q 46
The last digit of the expression 4×92×43×94×45×96×…×499×9100 is: