When you multiply a number by 1, you get the same number back. Ex. 10x1=10
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The negative number multiplied by one, the answer stays the same. for example -52 x 1 = -52
I think that the answer becomes 1 because lets say that your number was 24. The reciprocal of 24 = 1/24 and it you multiply 24/1 by 1/24 you get 24/24 = 1 (The reciprocal is a fraction flipped over i.e. bottom number becomes top and top number becomes bottom and with multiplying fractions, you just multiply all the tops and multiply all the bottoms.)
When you multiply a number by 100 percent, you are essentially multiplying it by 1. This is because 100 percent is equivalent to 1 as a decimal. Therefore, multiplying a number by 100 percent does not change the value of the number; it remains the same.
Any number multiplied by zero = 0
It depends. If you start with a positive number, then multiply by a positive greater than one and the answer is greater; multiply by 1 and the answer is the same; multiply by a number between 0 and 1 and the answer is smaller; multiply by 0 and the answer is 0; multiply by a number less than 0 and the answer is negative.