# What Do You Know About Amazing Calendar Trick

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If you want to entertain your friends and look smart at the same time, the magic calendar trick is one of the best options to choose. You will have to think fast, and, most of all, you'll have to have a little bit of knowledge about math. So, are you interested in playing the magician? If yes, complete our quiz now.

• 1.

### What's the first rule of the calendar trick?

• A.

To have someone circle a group of any numbers.

• B.

To have someone circle a group of 9 numbers.

• C.

To have someone circle a group of 3 numbers.

• D.

To have someone circle a group of 6 numbers.

B. To have someone circle a group of 9 numbers.
Explanation
The first rule of the calendar trick is to have someone circle a group of 9 numbers.

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• 2.

### What's the trick behind the magic calendar?

• A.

It's to multiply the number in the center of the circled numbers by 3.

• B.

It's to multiply the number in the center of the circled numbers by 10.

• C.

It's to multiply the number in the center of the circled numbers by 9.

• D.

It's to multiply the number in the center of the circled numbers by 5.

C. It's to multiply the number in the center of the circled numbers by 9.
Explanation
The trick behind the magic calendar is to multiply the number in the center of the circled numbers by 9. This can be observed by examining the pattern in the given calendar. Each circled number is obtained by multiplying the number in the center by 9.

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• 3.

### How can one multiply by 9 quickly?

• A.

By multiplying by 10 then subtracting the number.

• B.

By multiplying by 100 then subtracting the number.

• C.

By multiplying by 20 then subtracting the number.

• D.

By multiplying by 2 then subtracting the number.

A. By multiplying by 10 then subtracting the number.
Explanation
One can quickly multiply by 9 by multiplying the number by 10 and then subtracting the number. This is because multiplying by 10 is a simple operation, and subtracting the number is also relatively easy. By using this method, one can achieve the result of multiplying by 9 efficiently and quickly.

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• 4.

### What's the trick if your friend has to circle 20 numbers in a 5 by 4 rectangle?

• A.

To add the smallest and largest numbers that are circled and multiply their by 5.

• B.

To add the smallest and largest numbers that are circled and multiply their by 10.

• C.

To add the smallest and largest numbers that are circled and multiply their by 1.

• D.

To add the smallest and largest numbers that are circled and multiply their by 100.

B. To add the smallest and largest numbers that are circled and multiply their by 10.
Explanation
The trick is to circle the smallest and largest numbers in the 5 by 4 rectangle, and then add them together. After that, the sum is multiplied by 10. This is the correct answer because it follows the instructions given in the question, which specifically state to add the smallest and largest numbers and multiply their sum by 10.

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• 5.

### What's the Zeller formula?

• A.

D = k+ [(13 m-1)/5] +D [D/4] + [C/4] -2 C

• B.

D = k+ [(13 m-1)/5] +D [D/4] + [C/4] -2 C mod 3

• C.

D = k+ [(13 m-1)/5] +D [D/4] + [C/4] -2 C mod 7

• D.

D = k+ [(13 m-1)/5] +D [D/4] + [C/4] -2 mod 7

C. D = k+ [(13 m-1)/5] +D [D/4] + [C/4] -2 C mod 7
Explanation
The Zeller formula is used to calculate the day of the week for a given date. It takes into account the day (k), month (m), and year (D) and uses a set of mathematical operations to determine the day of the week. The formula includes divisions and modulus calculations, as well as the use of constants (C) and coefficients. The correct answer states that the formula includes a modulus 7 operation, which is necessary to obtain the day of the week as a number between 0 and 6, representing Sunday to Saturday respectively.

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• 6.

### What's a two-cube calendar?

• A.

It's a desk calendar consisting of 2 cubes with faces marked by digits 0 through 9.

• B.

It's a desk calendar consisting of 2 cubes with faces marked by digits 0 through 6.

• C.

It's a desk calendar consisting of 2 cubes with faces marked by digits 1 through 9.

• D.

It's a desk calendar consisting of 2 cubes with faces marked by digits 3 through 9.

A. It's a desk calendar consisting of 2 cubes with faces marked by digits 0 through 9.
Explanation
The correct answer is "It's a desk calendar consisting of 2 cubes with faces marked by digits 0 through 9." This means that the two cubes in the calendar have all the digits from 0 to 9 marked on their faces. This allows for a wide range of combinations and arrangements of the digits to represent different dates on the calendar.

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• 7.

### What's the "scientific American About"?

• A.

It's a math competition held every 2 years.

• B.

It's a TV game show

• C.

• D.

It's an American popular science magazine

D. It's an American popular science magazine
Explanation
The correct answer is "It's an American popular science magazine." This answer is supported by the fact that the question asks about what "Scientific American" is about, and the given answer states that it is a popular science magazine. This suggests that the magazine covers scientific topics and is popular among readers.

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• 8.

### What's a Sicherman dice?

• A.

They are the only pair of 4-sided dice that are not normal dice bear only positive integers.

• B.

They are the only pair of 8-sided dice that are not normal dice bear only positive integers.

• C.

They are the only pair of 6-sided dice that are not normal dice bear only positive integers.

• D.

They are the only pair of 10-sided dice that are not normal dice bear only positive integers.

C. They are the only pair of 6-sided dice that are not normal dice bear only positive integers.
Explanation
A Sicherman dice is a pair of dice that have the same probability distribution as a pair of standard six-sided dice, but with different numbers. In other words, when you roll a Sicherman dice, the sum of the numbers on each dice will have the same probability as rolling two regular dice. However, the numbers on the Sicherman dice are not the same as the numbers on regular dice. Therefore, they are the only pair of 6-sided dice that are not normal dice and only bear positive integers.

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• 9.

### What is the other term for Arabic numerals?

• A.

Hindu-Arabic numerals

• B.

Normal digits

• C.

Integers

• D.

Rounded numbers

A. Hindu-Arabic numerals
Explanation
The other term for Arabic numerals is Hindu-Arabic numerals. These numerals are the most commonly used symbols to represent numbers in the modern world. They originated in ancient India and were later adopted and popularized by the Arab mathematicians. Hindu-Arabic numerals are a combination of ten digits (0-9) that are used in a positional decimal system, allowing for efficient and accurate representation of numbers. They are widely used in various fields, including mathematics, science, and everyday life.

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• 10.

### What's the other activity that resembles the magic calendar?

• A.

The magic square

• B.

Soduko

• C.

Crosswords

• D.

A Chess game

A. The magic square
Explanation
The magic square is a grid of numbers where the sum of each row, column, and diagonal is the same. Similarly, the magic calendar is a grid of numbers where each row, column, and diagonal adds up to the same value. Both activities involve arranging numbers in a grid and require logical thinking and problem-solving skills. Therefore, the magic square is the other activity that resembles the magic calendar.

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