Well, all prime numbers other than 2 are odd. There are only 2 odd numbers between 45 and 50: 47 and 49. And one of them is a square number: 49=7*7. What remains is the only one you should need to check: 47.
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The Prime Numbers between 50 and 60 are: 53 and 59.
45 is nearest to 50 because it is closer to 50 on the number line. When determining which number is closer, you can look at the distance between the numbers. In this case, the distance between 45 and 50 is 5, while the distance between 45 and 40 is 5 as well. Since 5 is smaller than 10, 45 is closer to 50 than it is to 40.
The number halfway between 40 and 50 is the average of the two numbers. To find the average, you add the two numbers together and divide by 2. In this case, (40 + 50) / 2 = 45. So, 45 is the number halfway between 40 and 50.
The numbers 53, 59, 61 and 67 are prime.
The prime numbers between 40 and 50 are 41, 43, 47. So their sum is 131.