ok here is the problem. " How will the number 1890 look if tis written as the product of prime numbers?" that is what the problem says!!! i dont understand!!
2007-04-01 11:24:08 · 9 answers · asked by cooleokellogg2007 2 in Science & Mathematics ➔ Mathematics
The others have correct answers for you, but I want to tell you that prime factorization is the magic key for a lot of the math you do. When you understand how to find and use prime factors, then you can do all kinds of things with fractions, do mulitplication and division without a calculator, etc.
There are two different ways to get prime factorizations -- also called "a number written as the product of prime numbers". I don't know which you have been taught, but one is a factor tree, where you make something that looks like an upside down tree as you break the number into parts and each branch ends in a prime number (which can't be divided by anything but 1 or itself). Another method is to repeatedly by prime numbers. Either way, when you can't divide the number up any more, the prime numbers you have found can be multiplied together to make the original number.
No matter how much you hate math, please keep trying. Most people who hate math do so because they haven't mastered something key -- like times tables or prime factoring -- and that makes math harder for them. Keep asking questions and asking for help, and you'll find that math can be easy -- and fun!
I'll be rooting for you.
2007-04-01 11:45:45 · answer #1 · answered by Herbie 2 · 0⤊ 0⤋
What they're asking you is to do a prime factorization of 1890. This means that they want to to show prime numbers multiplying together to make 1890. I'll walk you through the steps. What you need to do is first find the biggest prime factor of 1890. When you find it, divide 1890 by that number. Then find the biggest prime factor of that new number. Repeat this process until you end up with a prime number.:
1) Find the biggest prime factor of 1890. The biggest prime factor of 1890 is '7.'
1890 / 7 = 270
2) Now, find the biggest prime factor of 270. It's '5.'
270 / 5 = 54
3) Find the biggest prime factor of 54. It's '3.'
45 / 3 = 18
4) Find the biggest prime factor of 18. It's '3.'
18 / 3 = 6
5) Find the biggest prime factor of 6. It's '3.'
6 / 3 = 2
6) Note that 2 itself is a prime number. This means that you're done. Now go back and multiply all the prime factors that we found.
1890 = 2 * 3 * 3 * 3 * 5 * 7
* As you can see, all the numbers are prime, and they multiply together to make 1890.
2007-04-01 18:34:06 · answer #2 · answered by عبد الله (ドラゴン) 5 · 0⤊ 0⤋
1890 = 2 x 5 x 7 x 3 x 3 x 3
2007-04-01 18:30:47 · answer #3 · answered by sir_knowalot 2 · 1⤊ 0⤋
2 x 3 x 3 x 3 x 5 x 7
2007-04-01 18:32:23 · answer #4 · answered by sparbles 5 · 0⤊ 0⤋
It just means to factor it down to prime numbers.
This is a multiple of 3 because its digits add up to a multiple of three (1+8+9+0=18 which is a multiple of 3).
1890=3*630
630=3*210
210=3*70
70=2*35
35=7*5 and those are both prime.
Now go back and see what the factors were.
1890=3*3*3*2*7*5
2007-04-01 18:29:37 · answer #5 · answered by ecolink 7 · 1⤊ 0⤋
Sir Knowalot got it.
It's frustrating when math uses its own terms. When they say "the product of," that means what you get when you multiply two or more numbers.
They were asking what prime numbers are multiplied to equal 1890.
2007-04-01 18:36:13 · answer #6 · answered by northernbornsoutherner 6 · 0⤊ 0⤋
prime numbers are numbers that do not have any whole number factors.
like 7 13 17 19... etc...
so you would have to choose prime numbers
that add up yo 1890
good luck!!!
2007-04-01 18:28:58 · answer #7 · answered by Anonymous · 0⤊ 0⤋
2*3^3*5*7
2007-04-01 18:30:20 · answer #8 · answered by sloedog42 1 · 0⤊ 0⤋
i think u have to divide by a prime # and make sure its quotient is a prime #.
2007-04-01 18:29:50 · answer #9 · answered by Anonymous · 0⤊ 0⤋