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