This follows from the way in which addition of whole numbers is defined.
2 mixed numbers can only be a whole when the 2 numerators add up to the number
When you add two or more prime numbers you will only end up with a whole number and not a decimal number.
The sum of two numbers is a whole number if both of the numbers are whole numbers, or if the sum of two fractions can be simplified to a whole number.
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No, it is not, because whole numbers must be positive.
Yes, any two whole numbers added together will equal a whole number.
If the two numbers are both whole numbers then yes
Yes, the product of two whole numbers is a whole number. For example 3*7 = 21
No. You can subtract two whole numbers and get a negative result. Whole numbers can't be negative.
The product of two nonzero whole numbers will be a nonzero whole number.
Yes, the difference of two whole numbers is always a whole number.
well that is easy to add two whole numbers like 8+10 is just 18 so you find the total of the two numbers. then to subtract you take it away so 9-4=5 then to check add the 2nd number (in this case 4) to what the sum equals and 4+5=9