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## Worksheets and How To Add/Subtract in Scientific Notation

(Start with How to Do Scientific Notation or go to worksheets)

Here is a simple way to add (or subtract) two numbers in scientific notation:

- Reformat one or both numbers so they have the same exponent.
- Isolate the two coefficients from the power-of-ten expression.
- Resolve the addition or subtraction of the two coefficients.
- Multiply the sum or quotient by the power-of-ten.
- Reformat the result so it has only one non-zero digit to the left of the decimal point.

Example 1: Add large numbers in superscript format 1.50x10 ^{3}+ 2.95x10^{4}

= 1.50x10^{3}+ 29.5x10^{3}

= (1.50 + 29.5) x 10^{3}

= 31x10^{3}

= 3.1x10^{4}Example 2: Subtract small numbers in E format 1.23E-2 - 4.56E-3

= 1.23E-2 - 0.456E-2

= (1.23 - 0.456)E-2

= 0.774E-2

= 7.74E-3