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Adding and Subtracting Numbers in Scientific Notation

Adding and Subtracting Numbers in Scientific Notation. Algebra I Seminar. Adding/Subtracting when Exponents are Equal. When the exponents are the same for all the numbers you are working with, add/subtract the base numbers then simply put the given exponent on the 10. Example 1.

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Adding and Subtracting Numbers in Scientific Notation

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  1. Adding and Subtracting Numbers in Scientific Notation Algebra I Seminar

  2. Adding/Subtracting when Exponents are Equal • When the exponents are the same for all the numbers you are working with, add/subtract the base numbers then simply put the given exponent on the 10.

  3. Example 1 • Given: 2.56 X 103 + 6.964 X 103 • Add: 2.56 + 6.964 = 9.524 • Answer: 9.524 X 103

  4. Example 2 • Given: 9.49 X 105 – 4.863 X 105 • Subtract: 9.49 – 4.863 = 4.627 • Answer: 4.627 X 105

  5. Adding/Subtracting when the Exponents are Different

  6. When adding or subtracting numbers in scientific notation, the exponents must be the same. • If they are different, you must move the decimal either right or left so that they will have the same exponent.

  7. Moving the Decimal • For each move of the decimal to the right you have to add -1 to the exponent. • For each move of the decimal to the left you have to add +1 to the exponent.

  8. Continued… • It does not matter which number you decide to move the decimal on, but remember that in the end both numbers have to have the same exponent on the 10.

  9. Example 1 • Given: 2.46 X 106 + 3.476 X 103 • Shift decimal 3 places to the right for 106. • Move: 2460 X 106-3 • Add: 2460 X 103 + 3.476 X 103 • Answer: 2463.476 X 103 • Answer:2.463476 X 106

  10. Example 2 • Given: 5.762 X 103 – 2.65 X 10-1 • Shift decimal 4 places to the left for 10-1. • Move: .000265 X 10(-1+4) • Subtract: 5.762 X 103-.000265 X 103 • Answer: 5.762 X 103

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