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**Mathematical Operations Using Numbers in Scientific Notation**

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**Adding All numbers must be expressed in the same power of 10**

(A x 10m) + (B x 10m) (A + B) x 10m (1.234 x 10‾³) + (5.623 x 10‾3) = 1.234 6.857 = x 10‾3 (answer is in correct sig figs)

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**Adding All numbers must be expressed in the same power of 10**

(A x 10m) + (B x 10m) (A + B) x 10m (2.2 x 10³) + (4.12 x 103) = Line up the decimals and add 2.2 x 10³ x 103 6.32 x 103 = 6.3 x 103 (round to correct sig figs)

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When moving decimals: If you move the decimal to the right, add (-1) to the exponent If you move the decimal to the left, add (+1) to the exponent

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10.85 X 10-2 need to move the decimal to the left so will add a (+1) = X = X 10-1 If your result is: x 102 need to move the decimal to the right so will add a (-1) = x = 2.33 X 101

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**1.234 Different Exponents (1.234 x 10‾³) + (5.623 x 10‾²) =**

Doesn’t matter which exponent you change (1.234 x 10‾³) + (56.23 x =-3) = x 10‾² 1.234 +56.23 x 10‾³ = x 10‾³ = x 10‾² ( x 10‾²) + (5.623 x 10‾²) = x 10‾²

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Addition ( x 10‾2) + (5.623 x 10‾²) = Doesn’t matter which exponent you change ( x 10‾²) + (5.623 x 10‾²) = x 10‾2 = x 10‾2 OR (1.234 x 10‾³) - (56.23 x =-3) = x 10‾² 1.234 x 10‾³ = x 10‾²

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**Check your work! (1.234 x 10‾³) + (5.623 x 10‾²) =**

= = x 10‾²

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Subtracting 2000 X 104 – 5 X 104 = 1995 X 104 Need to round answer to correct sig figs! 1995 X 104 becomes 2000 X 104 Still not done! 2000 X 104 = move the decimal 3 places to the left and add “3” to the exponent 2000 X = 2 x 107

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**Multiplying Multiply the decimal parts Add the exponents of 10s**

(A x 10m) x (B x 10n) (A x B) x 10(m +n) (1.23 x 103) x (7.60 x 102) = (1.23 x 7.60) x 10 (3 + 2) = x 10 5 = x 10 5 (ROUND TO CORRECT SIG FIGS)

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Example (4.16 x 103)(2 x 104) =

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**Dividing Divide the decimal parts Subtract the exponents**

(A x 10x) (B x 10y) (A B) x 10(x-y) or A B 10(x-y) x

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Example: (4.68 x 10-3) ÷ (4.00 x 10-5) 4.68 4.00 10 -3-(-5) = 1.17 x 102 x

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Using Pre-determined Measurements in Calculations The value given in your calculation will influence the number of sig figs in your answer.

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**Page 90 - Classroom exercises**

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