Computation

Computation

By Thương Trần

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​The value of (1 + 2 + 3 + … + 20) is 210.

What is the value of (2 + 4 + 6 + … + 40)?

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What should the starting number be in the following diagram ?

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In the addition problem at the right, each letter represents a digit and different letters represent different digits. What three-digit number does DER represent?

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Find the 3th number (from left to right) of the 12th row in the number pattern below

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A strange operator Z acts on numbers as follows:

Z312 = 243

Z123 = 461

Z221 = 422

Z218 =  ?

What result does it produce when it acts on number 218?

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The total weight of three groups of four animals are recorded as shown. Each animal of the same type has the same weight. What is the weight of each sheep?

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In the number triangle shown, every number not on the bottom row is equal to the sum of the two numbers below it. What is the number represented by the “?” mark?

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Kalle knows that $1111\times1111=1234321$   .

What is the answer of   $1111\times2222$  ?

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A special die has a number on each of its six faces. The sums of the numbers on opposite faces are all equal. Five of the numbers are 5, 6, 9, 11 and 14. What number is on the sixth face?

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The sum of the digits of the 10-digit number is 9. What is the product of the digits of this number?

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Every day Ahmad draw one flower in his note book. Maximum number of flowers in his note book after 10 years would be: 3653 or 3654??

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We make a sequence of figures with tiles.

The first four figures have 1, 4, 7 and 10 tiles, respectively.

How many tiles will the fifth figure have?

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Shaheen shoots two arrows at the target. In the drawing we see that her score is 5. If both arrows hit the target, how many different scores can she obtain?

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Write each of the numbers 0, 1, 2, 3, 4, 5, 6 in the squares to make the addition correct. Which digit will be in the grey square?

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Nick has written each of the numbers from 1 to 9 in the cells of the 3x3 table. Only four of these numbers can be seen in the figure. Nick has noticed that for the number 5 the sum of the numbers in the neighbouring cells equals 13 (neighbouring cells are cells sharing sides). He noticed the same applies for the number 6. Which number has Nick written in the shaded cell?