What is the 9 trick in math?
What you have observed: The sum of the digits of the number added to 9 is always equal to the sum of the digits of the result.
Take any four digit number and try the trick.
Your friends are amazed when you magically transform your hands into a calculator and multiply on your fingers!.
What are multiples 9?
The first ten multiples of 9 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90. For the tens places, note that the number 9 can be thought of as 0 tens and 9 ones so the tens place has a 0. The tens place of 18 is 1.
What multiplication makes 30?
30 = 1 x 30, 2 x 15, 3 x 10, or 5 x 6. Factors of 30: 1, 2, 3, 5, 6, 10, 15, 30.
Why Is 9 the perfect number?
The number 9 is revered in Hinduism and considered a complete, perfected and divine number because it represents the end of a cycle in the decimal system, which originated from the Indian subcontinent as early as 3000 BC. … Nine is a significant number in Norse Mythology.
Why is the number 9 so powerful?
Number 9 is a powerful number with its strength established in its strong affinity for spiritual enlightenment. It is also the strongest number with special traits that allow it to retain its form when multiplied or reduced by another number.
Why number 9 is magic?
Answer. (1) When you multiply nine by any number and add up the digits of the answer, you get 9. (2) The difference between a positive integer and the sum of its digits (or digital root) is a multiple of nine. … The digital root of 36 is 3+6 = 9, which means it is evenly divisible by nine.
What numbers add to and multiply to 9?
There are an infinite number of pairs of numbers which, when multiplied together, give 9. Some of them are: (1,9), (3,3); (2, 4.5), (1.5, 6), (-1, -9).
Why do all numbers add up to 9?
A multiple of 9 is the product of 9 with any integer. Alternatively it is the sum of a certain number of 9’s. … When 9 is added to a number whose units/ones value is not zero, one of the ones together with the nine add on to each other to make up one tens.