The sum is: 23+29+31+37 = 120
23 29 31 37.
To find the GCF, you first need to break the numbers down into their prime factors: 28 = 2x2x7 20 = 2x2x5 40 = 2x2x2x5 The next step is to find any common prime factors. In this case, all three numbers have two 2s as prime factors. Multiply these and you get 4. Therefore the GCF of 28, 20 and 40 is 4.
5x5=25 6x6=36 the only two prime numbers b/t 20 and 40 are 25 and 36
The prime numbers between 20 and 40 are 23, 29, 31 and 37 that is 4 out of 20 or 1 to 5
23 29 31 37.
23 29 31 37
The prime numbers (factors) of 40 are: 2 and 5
Multiples of 5 are not prime numbers except 5, so there are none. But, there are prime numbers between 20 and 40, like 23, 29, 31 and 37.
There are four prime numbers between 20 and 40
41,43, and 47 are all prime numbers. so there are three prime numbers between 40 and 50
23 29 31 37.
The sum is: 23+29+31+37 = 120
31 and 37 are the only prime numbers between 30 and 40
23 29 31 37.
There are four. 23,29,31,37
There are 4 prime numbers between 20 and 40.