ID 487

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ID 579

Find the smallest positive integer that must be added to 2010 in order to obtain a perfect square (a square of an integer).

ID 786

ID 1245

If you replace a, b, c and d with the numbers 1, 2, 3 and 4, what is the largest possible sum of the fractions?

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ID 1434

Add up all the digits of each license plate without using a calculator.

Find the plate with the largest total.

Remember, there may be more than one correct answer.

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In order to earn an A, students need to score at least 90% on the final test.

Who did not obtain an A in the class?

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ID 1841

Ann has $999 and Bill has $1,111.

How much money does Bill need to give to Ann, so that they would have the same amount of money?

ID 1844

I add three different numbers chosen from the following numbers: 1, 2, 3, 4, 5, 6.

How many different sums can we get?

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What is the largest integer number that satisfies this condition:

each digit from the second is double of the preceding digit?

ID 2099

Guesstimation.

Anna has 100,000 strands of hair with an average length of 40 cm or 1.31 ft.

How long is her hair?

Remember 1 km = 1000 meters = 100,000 cm = 0.62 miles

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The deadline for a project was originally Wednesday, September 17th.

The deadline was then changed to 48 days later.

What day of the week is the new deadline?

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If 1 gram of grass seed is needed to plant 1 square meter, how much grass seed will be needed to plant an entire field that is 110 meters long and 70 meters wide?

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Captain Hook has two pieces of rope.

One piece of rope is 84 meters and the other is 108 meters. He plans to cut the rope into pieces of equal lengths.

What is the greatest possible length of each piece?

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John's heart beats at a rate of 65 beats a minute at daytime and 50 beats a minute when he sleeps 8 hours.

How many times does his heart beat in twenty-four hours?

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Each of four children chose one of the following numbers: 1, 2, 3, 4.

They then multiply the chosen numbers.

Which number cannot be the product of those numbers?

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ID 3546

Bill has 7/8 of a melon.

He eats 1/3 of the original melon at breakfast.

What fraction of the original melon does he have left?

ID 3549

Put a plus sign or a multiplication sign between the following numbers to make the largest possible result.

How many times do you use the plus sign?

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If there are only 2 fields on the dartboard with 5 and 7 points, how many times must you throw your darts to score 32?

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A shop owner uses the same wheels for tricycles and bicycles.

How many bicycles and tricycles can he assemble from 77 wheels if he always produces twice as many bicycles?

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What is the difference between the biggest and the smallest four-digit integers each formed by different digits?

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