The number is still positive, but the range is positive infinity.
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It makes the number smaller. For Example: 20 x .5 = 10
Fraction refers to the amount to the right of the decimal point (amounts of less than 1), so if you multiply any (positive) number by a fraction its value will be reduced.
Nothing happens to the whole number. But the product is less than the whole number. The product might be another whole number, and it might have a fractional part.
Multiply by a number greater than 1 will increase the value. Multiplying by less than one will decrease the number.
The sum is less than the positive number. Example: 16 + -3= 13. As you can see 13 is less than 16 so the sum is less than the positive number.