452
All of them except for 83 and 89 which are prime numbers
60 and 80 :D
All of them except 83, 89 and 97 which are prime numbers
ANSWER: 70 and 80 are not prime numbers. They are composite numbers:70 is a composite number because the factors of 70 other 1 and itself (70) are 2, 5, 7, 10, 14, and 35.80 is also a composite number because the factors of 80 other 1 and itself (80) are 2, 4, 5, 8, 10,16, 20, and 40.
The composite numbers between 70 and 80 are 72, 74, 75, 76, 77 and 78.
All even numbers between 50 and 80 are composite.
452
81, 82, 84, 85, 86, 87, 88. 80 and 90 are composite too
All of them except for 83 and 89 which are prime numbers
60 and 80 :D
All of them except for 83, 89 and 97 which are prime numbers
All numbers between 80 and 100 except 83, 89, and 97 are composites.
All of them except 83, 89 and 97 which are prime numbers
ANSWER: 70 and 80 are not prime numbers. They are composite numbers:70 is a composite number because the factors of 70 other 1 and itself (70) are 2, 5, 7, 10, 14, and 35.80 is also a composite number because the factors of 80 other 1 and itself (80) are 2, 4, 5, 8, 10,16, 20, and 40.
80, 81, 82, 84, 85, 86, 87, 88, 90
23,29,31,37,41,43,47,53,59,61,67,71,73,79.