maths help plz?

Question

1, find all the prime numbers between 80 and 100
2, which numbers, less than 100, with a 1 in the units place are prime numbers?
3, list all the prime numbers which will divide exactly into:
1890 and 1155



first correct 10 pts plus i will star your next 3 questions.

Answer 1

1)83,87,89,97
2)11,31,41,61,71
3)1890 2,3,5,7
1155 3,5,7,11

Answer 2

(1) 83, 89, 97.
(2) 11, 31, 41, 61, 71.
(3a) 2, 3, 5 & 7 are the only prime numbers divide exactly into 1890.
(3b) 3, 5, 7 &11 are the only prime numbers divide exactly into 1155.

Answer 3

1. 83, 89, 97
2. 11, 31, 41, 61, 71
3. I didnt understand the 3rd question
1890 = 5 * 3 * 7 * 3 * 3 * 2
1157 = 5 * 3 * 7 * 11
If u are asking abt the common prime numbers then they are 5 , 3, 7

Answer 4

1. 83, 89, 97

2. 11, 31, 41, 61, 71, 91

3. 1890: 2 3^3 5 7
1155: 3 5 7 11

Answer 5

prime numbers between 80 and 100
83
87
89
97
numbers less than 100 with 1 in units are prime
11
31
41
61
71
all prime numbers divide exactly into 1890
2*945
2*5*189
2*5*3*63
2*3*5*3*21
2*3*3*3*5*7
all prime numbers divide exactly into 1155
5*231
5*3*77
5*3*7*11
3*5*7*11

Answer 6

1 = 83, 89, 97
2 = 11, 31, 41, 61 and 71
sorry number 3 couldnt do cus had to go

Answer 7

1. 83, 89, and 97
2.. 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71
3. 5

Answer 8

1.
83, 89, 97.

2.
11, 31,41, 61,71.

3.
1890; 2, 3, 5 ,7
1155; 3, 5, 7, 11.

Answer 9

1) 83,89,91,97

2)11,31,41,61,71,91 and 1 if you count trivial primes

3)1,2,3,5,7 for 1890
1,3,5,7,11 for 1155

Answer 10

80
1,2, 3,7,11,13,17,19,23,29,31,37,41,43,etc