Asked by plz help meee
is 89 prime or composite
prime
composite
if you can give me all the answers plz do
prime
composite
if you can give me all the answers plz do
Answers
Answered by
mathhelper
If you want to appear super smart to your fellow grade 6's
show them "Sieve of Eratosthenes" which works like this:
If you want to test if a given number is prime, like your 89
first guess what the closest square root of 89 is
here √89 is between 9 and 10
so list all the numbers from 2 to 9
-- is 89 divisible by 2 ? obviously not, since it is not even
so in your list, cross out the 2 and all remaining multiples of 2,
so gone are 2, 4 6, 8
-- is 89 divisible by 3, the first available number in your list ?
NO, so cross out the 3 and all multiples of 3, so gone are 3, 6, 9
So the only numbers left in your list are the 5 and 7
-- is 89 divisible by 5 ?? , NO, it does not end in a 5 or 0, so cross it out.
-- is 89 divisible by 7, the only number left?? NO,
All your divisors are crossed out,
so 89 is a prime number.
Try it with larger numbers, remember your list only has to go as far as
the square root of the number.
show them "Sieve of Eratosthenes" which works like this:
If you want to test if a given number is prime, like your 89
first guess what the closest square root of 89 is
here √89 is between 9 and 10
so list all the numbers from 2 to 9
-- is 89 divisible by 2 ? obviously not, since it is not even
so in your list, cross out the 2 and all remaining multiples of 2,
so gone are 2, 4 6, 8
-- is 89 divisible by 3, the first available number in your list ?
NO, so cross out the 3 and all multiples of 3, so gone are 3, 6, 9
So the only numbers left in your list are the 5 and 7
-- is 89 divisible by 5 ?? , NO, it does not end in a 5 or 0, so cross it out.
-- is 89 divisible by 7, the only number left?? NO,
All your divisors are crossed out,
so 89 is a prime number.
Try it with larger numbers, remember your list only has to go as far as
the square root of the number.
Answered by
👤 Mrs. Maria
Hi! If you need help look up some videos from the web on prime and composite here's some tips :
prime number: number greater than 1 that is not a product of two smaller natural numbers.
composite number: is a positive integer that can be formed by multiplying two smaller positive integers.
Hope it helps,
Jiskha Helping Teachers
Company number : 214-556-5480
© 2021
prime number: number greater than 1 that is not a product of two smaller natural numbers.
composite number: is a positive integer that can be formed by multiplying two smaller positive integers.
Hope it helps,
Jiskha Helping Teachers
Company number : 214-556-5480
© 2021
Answered by
I am dum
I need help plz help plz!!!
Answered by
I am dum
if you read my name you would know that is why I need help so PLZ HELP
Answered by
I am dum
PLZ I NEED ANSWERS
Answered by
😉Facts😎
I need help cause I am also dum!!!!
Answered by
will
does anyone have all the answers?
Answered by
I did the practice <3
A=answer
1. Is 89 prime or composite, A: prime
2. Is 93 prime or composite, A: composite
3. 432 is divisible by.. A: 2 and 3
4. 75, A: 5 5 x 3
5. 40, A: 2 2 2 x 5
6. 91, A: 7 x 13
7. 24 and 78, A: 6
8. 23 and 115. A: 23
9. 12 and 64, A:4
10. 5(2x+3), A: 10x + 15
I originally got a 80, but I reviewed all correct answers , So you guys should get a 100!
1. Is 89 prime or composite, A: prime
2. Is 93 prime or composite, A: composite
3. 432 is divisible by.. A: 2 and 3
4. 75, A: 5 5 x 3
5. 40, A: 2 2 2 x 5
6. 91, A: 7 x 13
7. 24 and 78, A: 6
8. 23 and 115. A: 23
9. 12 and 64, A:4
10. 5(2x+3), A: 10x + 15
I originally got a 80, but I reviewed all correct answers , So you guys should get a 100!
Answered by
“I did the practice <3” Is correct!
OMG TYSM I PASSED THE PRACTICE ILY
Answered by
No Name
thanks bro :(
Answered by
CorgiLover
I only got an 80 but it's good enough for me
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