91, 93, 95, 97, 99, 101, 103, 105, 107, 109
109
10
The numbers 97, 101, 103, 107 and 109 are prime.
The odd factors of 90 are 1,3,5,9 and 15.
90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110
97
The only prime numbers between 81 and 90 is... 83
The numbers 97, 101, 103, 107 and 109 are prime.
The odd factors of 90 are 1,3,5,9 and 15.
The are six such numbers: 18,36,54,72, 90 and 108 .
No. It's even.
70 80 80 80 90 90 100 100 110 110 120 130 160Range = 160 - 70 = 90
99
70 80 80 80 90 90 100 100 110 110 120 130 160Mode = 80
First odd number greater than 20 is 21 Last odd number less than 200 is 199 → number of odd numbers between 20 and 200 is (199 - 21) ÷ 2 + 1 = 90
Since we are talking for the sum of digits, then we are talking about 2-digit numbers between 1 and 100, which are 90 numbers (10 to 99). From these numbers only half of them satisfy the above condition, that is 45 numbers. So 50% of 2-digit numbers between 1 and 100 have an odd sum of their digits.
Since 270 is an even number, then three consecutive odd numbers cannot add to 270. ,because Odd + odd = even (2 numbers_ Even + odd = odd ( plus a third number) odd + odd = even (plus a fourth number) even + odd = odd (plus a fifth number) Notice from the table that the third odd number gives an odd answer; not an even answer. e.g. three odd numbers 3,5, & 7. 3 + 5 = 8 (even) 8 + 7 = 15 ( odd) et. seq.,
90, 91, 92, 93, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, 110
The only prime numbers between 81 and 90 is... 83