- What is a magic number in maths?
- What three numbers add up to 9?
- What is the 9 trick in math?
- Is 9 the most powerful number?
- Is 9 a composite number?
- What does factor mean?
- Why do all multiples of 9 add up to 9?
- Why 9 is a magic number?
- Is 9 a good luck number?
- Which number is the luckiest?
- Is the number 9 evil?
- What are the factors of 9?
- What is the trick to the 9 times table?
- Why is 1089 a magic number?
- Is 8 a lucky number?
- What is nine as a number?

## What is a magic number in maths?

What is the magic number in mathematics.

…

Discovered by mathemagician Srinivas Ramanujan, 1729 is said to be the magic number because it is the sole number which can be expressed as the sum of the cubes of two different sets of numbers..

## What three numbers add up to 9?

2 + 7 = 9, cross out 2 and 7. 2.4 + 3 = 9, cross out 4, 3 and 2. 3. There are no other groups of numbers adding up to 9.

## What is the 9 trick in math?

A Mathemagical Trick Start by thinking of a number, any number. Now, multiply that number by 9. If the result is a multi-digit number, add its digits together to come up with a new number. If that new number is still a multi-digit number, add its digits together to come up with yet another new number.

## Is 9 the most powerful number?

Number 9 is the strongest number among all numbers. … For example, 9 × 2 = 18, and 1+8 = 9. Even 9×10 = 90 reduces to 9 since 9+0 = 9.

## Is 9 a composite number?

A whole number that can be divided exactly by numbers other than 1 or itself. Example: 9 can be divided exactly by 3 (as well as 1 and 9), so 9 is a composite number.

## What does factor mean?

noun. one of the elements contributing to a particular result or situation: Poverty is only one of the factors in crime. Mathematics. one of two or more numbers, algebraic expressions, or the like, that when multiplied together produce a given product; a divisor: 6 and 3 are factors of 18.

## Why do all multiples of 9 add up to 9?

Every time you add one to a digit (which is the same as adding 10, 100, 1000, etc) you get a number that is one more than a multiple of 9, so you have to subtract one from the number, which brings the sum of the digits back to 9.

## Why 9 is a magic number?

Nine is a Motzkin number. … In base 10, a positive number is divisible by 9 if and only if its digital root is 9. That is, if any natural number is multiplied by 9, and the digits of the answer are repeatedly added until it is just one digit, the sum will be nine: 2 × 9 = 18 (1 + 8 = 9)

## Is 9 a good luck number?

9 (九, JIǓ) – LUCKY 九 sounds just like 久 (jiǔ), which means “long lasting” and “eternity” in Chinese. At birthday and wedding celebrations, the number 9 is welcome as it represents longevity. 9 was also traditionally associated with the Chinese emperor.

## Which number is the luckiest?

8 has long been regarded as the luckiest number in Chinese culture. With pronunciation of ‘Ba’ in Chinese, no. 8 sounds similar to the word ‘Fa’, which means to make a fortune. It contains meanings of prosperity, success and high social status too, so all business men favor it very much.

## Is the number 9 evil?

The first evil numbers are: 0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 23, 24, 27, 29, 30, 33, 34, 36, 39 …

## What are the factors of 9?

Table of Factors and MultiplesFactorsMultiples1, 3, 99361, 2, 5, 1010401, 1111441, 2, 3, 4, 6, 12124841 more rows

## What is the trick to the 9 times table?

To find the answer to another 9 × table question, just hold down the correct finger and count the fingers on either side. So you hold down your 5th finger for 5 × 9, your 7th finger for 7 × 9, and so on.

## Why is 1089 a magic number?

1089 is widely used in magic tricks because it can be “produced” from any two three-digit numbers. This allows it to be used as the basis for a Magician’s Choice. … Reverse the digits, and subtract the smaller from the larger one. Add to this result the number produced by reversing its digits.

## Is 8 a lucky number?

The number eight is considered to be a lucky number in Chinese and other Asian cultures. Eight (八; accounting 捌; pinyin bā) is considered a lucky number in Chinese culture because it sounds like the word meaning to generate wealth (發(T) 发(S); Pinyin: fā). Property with the number 8 may be valued greatly by Chinese.

## What is nine as a number?

Nine is the Arabic number which comes after 8 and before 10. It is an odd number, and is the highest single-digit number. It is also a square number. In Roman numerals, nine can be written as IX.