Usually this would be done by weighing them.
you just wrote the answer.............................641
30% of 641= 30% * 641= 0.3 * 641= 192.3
To find the factors of a number, when there are no obvious ones, first square root that number. In this case, 641 would square root to somewhere between 25 and 26. The next step is to divide 641 by each prime number between 1 and 25 in turn, seeing if it has any divisors. 641 can be shown to have no divisors between 1 and 25, and thus we can conclude it is prime. Therefore, the only factors of 641 are 1 and 641.
641 millionths is rational because it can be written as a ratio of two integers, 641:1000000. This means that 641 millionths is equal to 641/1000000, which is a rational number.
641 * 46 = 29486.
Yes 641 is a prime number. You would need to check all the factors up to the square root of 641. So you need to look at all the possible prime factors up to 25. Some can be skipped such as 2 and 3.
641 millionths is 641 divided by one miilion. That is, 641/1,000,000
2 x 641
48 percent of 641 is 307.68
0.0624
640
91.5714