Because it would remain the same number if it was multiplied by just the 1.
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The answer is 90. Dividing in half is also same as multiplying it by 2. Then you add 10, you'll get 90.
When you divide 30 by half, you are essentially dividing 30 by 0.5, which equals 60. Adding 10 to 60 gives you a final result of 70.
"Product" means the result of multiplying two numbers, and you've listed only one number. The product of 101 and any other number is ten times the other number.
Multiplying a real number by a positive power of ten moves the decimal point that number (the exponent) of places to the right. Multiplying by a negative power of ten moves it to the left. For example, the -3 power of 10 is 1/1000; multiplying by that moves the decimal point 3 places to the left.