multiplying by 1/2 is the same as dividing by 2.
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When you multiply a positive number by a negative number you always get a negative number.
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.
30 cm. The perimeter of a polygon is the sum of its sides; as this one is regular, we can equivalently multiply one side by the number of sides: 5 x 6.
Multiply the number by another number and the product is the multiple
multiply it by 4