Q: How is the number 128,180 written in Scientific Notation?

 A: 1.2818 x 105

Why is 128,180 written as 1.2818 x 105 in scientific notation?

The purpose of scientific notation is for scientists to write very large, or very small, numbers with ease.

Calculating scientific notation for a positive integer is simple, as it always follows this notation:

a x 10b

Follow the steps below to see how 128,180 is written in scientific notation.

Step 1

To find a, take the number and move a decimal place to the right one position.

  • Original Number: 128,180
  • New Number: 1.28180

Step 2

Now, to find b, count how many places to the right of the decimal.

New Number: 1.28180
Decimal Count: 12345

There are 5 places to the right of the decimal place.

Step 3

Building upon what we know above, we can now reconstruct the number into scientific notation.

Remember, the notation is: a x 10b

a = 1.2818 (Please notice any zeroes on the end have been removed)

b = 5

Now the whole thing:

1.2818 x 105

Step 4

Check your work:

105 = 100,000 x 1.2818 = 128,180


More Scientific Notation Examples

128,178128,179128,181128,182
1.28178 x 1051.28179 x 1051.28181 x 1051.28182 x 105

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