How about: 120+1.2 = 121.2
9 and 36
31 & 67
When you add two or more prime numbers you will only end up with a whole number and not a decimal number.
Add all of the numbers up, and then divide that result by how many numbers there were, e.g. 1,2,3,4,5. Added up they make 15. As there are five numbers there, you divide 15 by 5, and you get 3. Voila.
yes 1428/3 = 476 if you add numbers up and you can divide sum by 3 then it is divisible by 3 1+4+2+8 = 15 which is divisible by 3
5
37 & 41
How about: 120+1.2 = 121.2
Pairs of prime numbers which add up to 82 are:3 + 7911 + 7123 + 5929 + 5341 + 41
I am not sure if any two consecutive numbers can add up to an even number.
4 and 9.
16
13 & 17
9 and 36
31 & 67
Start with the natural numbers, 0, 1, 2, ... .Then add the set of negative numbers: this makes up the integers. Next add in the set of ratios of any two integers (the second being non-zero): this makes up the rational numbers. Next add in the set of all numbers which cannot be expressed as terminating or repeating decimal numbers. This is the set of irrational numbers. The rationals and irrationals, together, make up the set of real numbers.