10 * 100,000 = 1,000,000
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100,203 in expanded form is (1 x 100000) + (0 x 10000) + (0 x 1000) + (2 x 100) + (0 x 10) + (3 x 1)(1x1,000)+(2x3) or (1 x 10^5) + (0 x 10^4) + (0 x 10^3) + (2 x 10^2) + (0 x 10^1) + (3 x 10^0)100000 + 200 + 3
6.48 x 10-5 = 6.48 x 1/105 = 6.48 x 1/100000 = 6.48 ÷ 100000 = 0.0000648
100000 x 2 = 200,000
1*10^-5 = 1/100000 or 0.00001
If zero is permitted as the first digit then the number of combinations is 10 x 10 x 10 x 10 x 10 = 100000 If zero is not permitted then the number of combination is :- 9 x 10 x 10 x 10 x 10 = 90000