750,000 = (7 x 100000) + (5 x 10000) + (0 x 1000) + (0 x 100) + (0 x 10) + (0 x 1)
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162 = 256256 in expanded notation is: (2 x 100) + (5 x 10) + (6 x 1)
Expanded notation is when you write a number to show each digit's value. For example, you would write 5329 as 5000+300+20+9.
It is 3.1*10^10 in scientific notation
0.5 in Scientific Notation = 5 x 10-1
Scientific notation looks like a*10bwhere 1 ≤ |a| < 10 is a decimal number and bis an integer.