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This will happen if the fractional parts of the numbers sum to 1.

Q: When is the sum of two decimals equal to a whole number?

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When the fractional parts, if any, of the two decimal numbers sum to 1.

The sum of 3 consecutive whole numbers is always equal to 3 times the middle number in that sequence.

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The number of 0s in the product is equal to the sum of the number of 0s in the whole number that you started with and the power [of ten].

The sum of any two consecutive whole numbers is always odd, and equal to one more than twice the first number (2x+1).

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yes

When the fractional parts, if any, of the two decimal numbers sum to 1.

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Sure. As an example, let's say that one of them has 999 'ones' and then a '2' after the decimal point,and the other one has a thousand '8's after the point. Their sum is a whole number.0.11120.8888Sum = 1.0000I'm sure there are a lot more.

The sum of the number of protons and the number of nuetrons.

The sum of 3 consecutive whole numbers is always equal to 3 times the middle number in that sequence.

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The number of 0s in the product is equal to the sum of the number of 0s in the whole number that you started with and the power [of ten].

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.

The sum of three consecutive whole numbers is equal to three times the middle number. For example, if the middle number is "x", then the sum is equal to x + (x - 1) + (x + 1), which simplifies to 3x.

The sum of any two consecutive whole numbers is always odd, and equal to one more than twice the first number (2x+1).

20/5 = 4. You can treat the fraction as a division sum.