4/10 = 0.4
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10-6 = 4
6 and 4/10 = 6.4 as a decimal
I'm guessing you mean 5 and 4/10 or 54/10. To write this as a decimal, you can simply use division, but dividing by ten is very easy: just move the decimal to the left once. So 54 / 10 = 5.4
Write in decimal form (3 x 101) + (4 x 100)
Move 4 decimal places to the right and we write the term as: 2.5 x 10-4