If not what numbers can they be divided by?
2007-10-23 04:03:22 · 19 answers · asked by Kirsty-Luan H 2 in Education & Reference ➔ Primary & Secondary Education
for all your information I'm not doing homework I'm a 25 year old Primary teacher trying to double check my working out for a classroom display
2007-10-23 06:03:10 · update #1
nope
51 divided by 3 is 17
69 divided by 3 is 23
and 38 can be divided by 2 to get 19
2007-10-23 04:31:50 · answer #1 · answered by penky03 2 · 0⤊ 0⤋
No prime numbers are those that can only be divided by itself e.g 3 , 7 , 11 , 13 17, 19, 29 , 31, 37, 41 etc
51 can be divided by 3 as can 69 , and 38 can be divided by 2
2007-10-23 11:14:06 · answer #2 · answered by Scobill 7 · 0⤊ 0⤋
None are prime!
51 and 69 are both divisible by 3 abd 38 by 2.
If you add the digits of 51 you get 6, a multiple of 3.
The same is true for 69, which has digit sum 15.
If the sum of the digits of an integer is divisible
by 3, so is the original integer.
2007-10-23 11:08:55 · answer #3 · answered by steiner1745 7 · 1⤊ 0⤋
None of these numbers are prime numbers because each one has more factors or divisors than 1 and itself.
The prime numbers between 1 an 100 are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 62, 67, 72, 72, 79, 83, and 97.
51 can be divided by: 1, 3, 17 and 51.
69 can be divided by: 1, 3, 23 and 69.
38 can be divided by: 1, 2, 19 and 38
PS. most people forget 1 and the number itself!
2007-10-23 11:20:37 · answer #4 · answered by RATTY 7 · 1⤊ 1⤋
51 = 17 x 3
69 = 23 x 3
38 = 19 x 2
2007-10-23 11:05:37 · answer #5 · answered by Marky 6 · 4⤊ 0⤋
51 can be divided by 3 69 can be divided by 3 also. 38 can be divided by 2
51/3 is 17
69/3 is 23
and 38/2 is 19
2007-10-23 11:08:35 · answer #6 · answered by Sammy C 2 · 1⤊ 0⤋
51 can be divided by 3, 69 can be divided by 3 and 38 can be divided by 2...
2007-10-23 11:06:54 · answer #7 · answered by sweethunibabi 2 · 0⤊ 0⤋
i think 51 is but 38 by 2 and 69 by 3
2007-10-23 11:05:56 · answer #8 · answered by chelley 3 · 0⤊ 2⤋
51 and 69 are divisible by 3. 38 is an even number and therefore divisible by 2.
2007-10-23 11:06:36 · answer #9 · answered by 006 6 · 0⤊ 0⤋
51 is divisible by 3
69 is divisible by 3
38 is divisible by 2
P.S. No even number is prime; they are ALL divisible by 2.
Any number whose digits add up to a multiple of 3 is divisible by 3. (5+1 = 6; 6+9 = 15)
2007-10-23 11:05:49 · answer #10 · answered by jurydoc 7 · 1⤊ 0⤋