ok its pretty simple but i dont know wat to put on my answer sheet.
Test the number for divisibility by 2, 3, 4, 5, 6, 8,9, and 10.
1. 128 2. 432 3. 22,480 4. 638,928
2007-08-13 14:48:02 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
ok she sent this to us before school even started. we start tomorrow
2007-08-13 14:59:18 · update #1
1. 128 is divisble by:
-2,4,8
2. 432 is divisible by:
-2,3,4,6,8,9
3. 22,480 is divisible by:
-2,4,5,8,10
4. 638,928 is divisible by:
-2,3,4,6,8,9
hope this helps!
2007-08-13 16:28:12 · answer #1 · answered by Anonymous · 0⤊ 0⤋
they want you to learn the quick rules for all of those numbers.
If it's even, it's divisible by 2, so the last digit needs to be divisible by 2.
If the total of all of the digits add to a number divisible by 3, it's divisible by 3. Example 432 : 4+3+2= 9, which is divisible by three, so 432 is divisible by three.
If the last two digits are divisible by 4, then the whole number is divisible by 4.
If the last digit is a zero, then it's divisible by 10.
You can find the other rules on your own. Hopefully.
2007-08-13 22:00:46 · answer #2 · answered by les 4 · 0⤊ 0⤋
You need to learn the rules for divisibility. Like a number is divisible by 3 if the sum of its digits is divisible by 3 (same for 9). If it ends in 0 it's divisible by 10; if ends in 5 or 0 it's divisible by 5; if ends in an even digit it's divisible by 2; if last 2 digits are divisible by 4 the whole number is; if last 3 digits divisible by 8 the whole number is; if 2 and 3 both work then so does 6
2007-08-13 21:57:02 · answer #3 · answered by hayharbr 7 · 0⤊ 0⤋
Here are some simple divisibility tests.
A number is divisible by
2 if it is even
3 if the sum of its digits is divisible by 3
4 if the number formed by the last two digits is divisible by 4
5 if it ends in 5 or 0
6 if it is divisible by 2 and 3
8 if the number formed by the last 3 digits is divisible by 8
9 if the sum of its digits is divisible by 9
10 if it ends in 0
2007-08-13 21:56:02 · answer #4 · answered by FIESTA 3 · 1⤊ 0⤋
Let's review our divisibiliry rules.
A number is divisible by 2 if it ends in 2,4,6,8,0
A number is divisible by 3 if the sum of its digits is
divisible by 3.
A number is divisible by 9 if the sum of its digits is
divisible by 9.
A number is divisible by 4 if its last 2 digits form
a number divisible by 4
A number is divisible by 8 if its last 3 digits
form a number divisible by 8.
A number is divisible by 6 if it is divisible by 2 and 3.
A number is divisible by 5 if it ends in 5 or 0
A number is divisible by 10 if it ends in 0.
If a number is divisible by 8 it is also divisible by 4 and 2.
If a number is divisible by 4 it is also divisible by 2.
If a number is divisible by 9 it is also divisible by 3.
If a number is divisible by 10 it is also divisible by 5.
Now let's go to work.
128 is divisible by 8. Just divide.
So 128 is divisible by 2,4 and 8.
432 is divisible by 9 because the sum of its
digits is 9.
It is also divisible by 8. Just divide.
So 432 is divisible by 2,3,4,6,8 and 9.
22480 ends in 0 so it is divisible by 10
and 480 is divisible by 8, so 22480
is divisible by 2,4,5,8 and 10.
638928 is divisible by 9 because the sum of
its digits is 36. It is also divisible by 8 because
928 is divisible by 8.
So 638928 is divisible by
2,3,4,6,8 and 9.
Hope that helps!!
2007-08-13 23:14:32 · answer #5 · answered by steiner1745 7 · 0⤊ 0⤋
don't even try and cheat, you will turn out dumb. ask your parents to help you or you should've been listening in class. this is really easy and you should know if you were listening.
2007-08-13 21:55:51 · answer #6 · answered by Anonymous · 0⤊ 2⤋
Sorry my Friend. You're screwed!
2007-08-13 21:54:35 · answer #7 · answered by METALLICA 5 · 0⤊ 2⤋
yea. absolutely screwed.......but try the prime numbers.
2007-08-13 21:55:55 · answer #8 · answered by atticus 3 · 0⤊ 2⤋
wow i have no clue
2007-08-13 21:55:42 · answer #9 · answered by sweetgirl 7 · 0⤊ 2⤋