2.8 multiplied by 10 to yhe ninth power is 2,800,000,000. To arrive at this answer you'd move the decimal point to the right nine times adding zeroes as place holders, not to be confused with adding nine zeroes.
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52 multiplied by 28 is 1456
28 multiplied by 8 is 224.
140 multiplied by 2 28 multiplied by 10 There are many more ways to multiply to get 280.
28 x 10
28 multiplied by 30 is 840.