0
20(?),31,42,53,64,75,86,97 Gosh that was hard work.
You can be 96, 85, 74, 63, 52, 41, and 30.
3
All but the number five are multiples of 5.
There are many number systems. The real numbers, the rational numbers, the complex numbers and some more esoteric ones such as p-adic numbers are all number systems.
No, rational number are ones that can be written as a/b where a and b are integers. Irrational numbers are those real number that are NOT rational.
10 or 5
The ones with less than three factors.
You can be 96, 85, 74, 63, 52, 41, and 30.
3
3
You look for a table of prime numbers. Or you try out each integer from 2-100, to see which ones don't have smaller factors. For numbers less to 100, it is enough to check whether each number is divisible by 2, 3, 5 and 7.
34,24,23,14,13, or even 12.
It is an odd number, If you are going to answer these type of questions in the future, you just find the ones place, if the ones have the number 1,3,5,7 or 9 in them it is odd, and if the ones have the numbers 2,4,6 or 8 in them it is even. Hope I helped :)
The ones digit in the product from multiplying the 305 prime numbers less than 2012 is 0 because the ones digit becomes 0 after 2 and 5 have been multiplied and remains unchanged after more prime numbers are multiplied.
72 has two ones.
40, 51, 62, 73, 84, and 95
Half of all square numbers are odd. They are the ones which are the square of an odd number.