1 / 14

12.7 2 cm

12.7 2 cm. x 7.5 8 cm. What is wrong with these measurements and calculation?. 12.7 1 cm. Missing Estimate. ± Estimate. 12.7 2 cm. 12.7 cm. 12.7 3 cm. 7.6 cm. 7.5 7 cm. 7.5 8 cm. 7.5 9 cm. 96. 417 6 cm 2. 96. 41 8 cm 2. 12.7 cm. 96. 4 2 cm 2. x 7.6 cm. 3 S.F.

pandora-mcfarland
Télécharger la présentation

12.7 2 cm

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 12.72 cm x 7.58 cm What is wrong with these measurements and calculation? 12.71 cm Missing Estimate ± Estimate 12.72 cm 12.7 cm 12.73 cm 7.6 cm 7.57 cm 7.58 cm 7.59 cm 96.4176 cm2 96.418 cm2 12.7 cm 96.42 cm2 x 7.6 cm 3 S.F. 96.4 cm2 96.52 cm2 96. cm2

  2. REVIEW: How many Sig Figs? 3 4 3 2 1 4 4 6 1 (Infinite if counting) 5 • 2.83 • 36.77 • 14.0 • 0.0033 • 0.02 • 0.2410 • 2.350 x 10–2 • 1.00009 • 3 • 0.0056040

  3. Practice Rounding with Sig Figs 1.56 0.00374 1370 129,000 1.67 106 a) 1.5587 b) 0.0037421 c) 1367 d) 128,522 e) 1.6683 106 d) Your Final number must be of the same value as the number you started with, 129,000 and not 129. Is $129,000 the same as $129 ??? Make (round) the following into a 3 Sig Fig number

  4. Practice Rounding with Sig Figs Make (round) the following into a 4 Sig Fig number a) 4965.03  b) 780,582  c) 1999.5 • 4965 • 780,600 NOT 7,806 • or 2.000 x 103 Decimal is Present (from the left)  Remember : in scientific notation all digits are significant : 2.000 = 4 s.f.

  5. Calculating Sig Figs for MULTIPLICATION and DIVISION: Multiplication & Division = LEAST number of sig figs RULE 1. In carrying out a multiplication or division, the answer cannot have more significant figures than either of the original numbers. The product is limited to 3 sig figs

  6. Multiplication & Division = LEAST number of sig figs 11 cm2 1) 47.37 cm x 0.24 cm = 11.3688 cm2 4 s.f. 2 s.f. 1.1 x 101 cm2 347.8 m2 2) 126.46 m x 2.750 m = 347.765 m2 5 s.f. 4 s.f. 3.478 x 102 m2 10,000 m2 3) 51.3 m x 200 m = 10,260 m2 3 s.f. 1 s.f. 1 x 104 m2 7,300 km2 4) 61.00 km x 120 km = 7,320 km2 4 s.f. 2 s.f. 7.3 x 103 km2

  7. Multiplication & Division = LEAST number of sig figs Practice Problems: Round to the correct number of sig figs a) b) c) d) e) 49.7 46.4 .05985 1.586107 1.000 32.27  1.54 = 49.6958 3.68  .07925 = 46.4353312 1.750  .0342000 = 0.05985 3.2650106 4.858 = 1.586137  107 6.0221023 1.66110-24= 1.000252

  8. Calculating Sig Figs for ADDITION and SUBTRACTION: Addition & Subtraction = LEAST number of decimal places • RULE 2. In carrying out an addition or subtraction, the answer cannot have more digits after the decimal point than either of the original numbers.

  9. Addition & Subtraction = LEAST number of decimal places Round to the correct number of sig figs. 25.5 32.72 320 +34.270‑ 0.0049+ 12.5 59.770 32.7151 332.5 59.8 32.72 330 Look for the last important digit (with highest value)

  10. Addition & Subtraction = LEAST number of decimal places Round to the correct number of sig figs. HINT: Look for the last important digit (with highest value) a) b) c) d) .56 + .153 = .713 82000 + 5.32 = 82005.32 10.0 - 9.8742 = .12580 10 – 9.8742 = .12580 .71(hundredths place) 82000 (Thousands place) .1 0 What is the difference between these two values? • 10 • - 9.8742 • 0.12580 c) 10.0 - 9.8742 0.12580

  11. Mixed Order of Operation Multiplication & Division = LEAST number of sig figs Addition & Subtraction = LEAST number of decimal places 4 s.f. 8.52 + 4.1586  18.73 + 153.2 = (8.52+ 4.1586)  (18.73 + 153.2) = = 8.52 + 77.89+ 153.2 = 239.61 = 239.6 2180. 4 s.f. Tenths place = 12.68 171.9 = 2179.692 = 4 s.f. 4 s.f. 4 s.f.

  12. What is Density? Density = mass/volume Density is the amount of matter (mass) within a given space (volume) Mass = 4.62 g Volume = 2.0 cm3 Density = mass/volume Density = 4.62 g / 2.0 cm3 Density = 2.3 g/cm3 _1 What is Kelvin? Kelvin = °Celsius + 273 .15 Kelvin is SI unit for temperature. The Kelvin temperature scale takes “absolute zero” into account Kelvin = °Celsius + 273 Kelvin = 22.4 °C + 273 Kelvin = 295 °C Temp = 22.4 °C _.4

  13. 12.72 cm x 7.58 cm What is wrong with these measurements and calculation? 12.71 cm Missing Estimate ± Estimate 12.72 cm 12.7 cm 12.73 cm AREA = 96.2, 96.3, 96.4, 96.5, 96.6 7.6 cm 7.57 cm 7.58 cm 7.59 cm 96.4176 cm2 96.418 cm2 12.7 cm 96.41 cm2 x 7.6 cm 3 S.F. 96.4 cm2 96.52 cm2 96. cm2

  14. 4 s.f. 3 s.f. 96.2 cm2 96.3 cm2 96.4 cm2 Multiplication & Division = LEAST number of sig figs 96.3 cm2 96.5 cm2 96.4 cm2 96.5 cm2 96.5 cm2 96.6 cm2

More Related