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  1. Entry Task: October 1st Monday GRAB A NEW ENTRY TASK SHEET Question: 12.34 cm X 1.2 cm = _____cm You have 5 minutes!

  2. Agenda • Sign off and discuss Math & Sci numbers • Self Check- on Scientific Numbers- Ch. 2 • P of U on Ch. 2

  3. 1. Determine the number of significant digits in each of the following. a) 6.751g c) 2500 m e) 0.106 cm 0.157 kg d) 0.070 g f) 0.0067 g 3 2-4 4 2 2 3

  4. 1. Determine the number of significant digits in each of the following. g) 26.509 cm i) 2.690 g h) 54.52 cm3 j) 43.07 cm 5 4 4 4

  5. Convert to the appropriate units and place into Scientific notation. K h da b d c m a) 0.075 kg to mg   b) 1500 mm to km 0.036 m to mm d) 1.00 kL to dL 75000 mg 7.5 x 104 mg 0.001500 km 1.500 x 10-3 km 36 mm 3.6 x 101mm 10000 dL 1.00 x 104dL

  6. 2. Convert to the appropriate units and place into Scientific notation. K h da b d c m g) 65 ml to hl h) 750 kg to g i) 2.36 hg to g 0.00065 hL 6.5 x 10-4hL 750000 g 7.50 x 105 g 236 g 2.36 x 102 g

  7. 3. Add these measurements a) 16.5 cm + 8 cm + 4.37 cm = 13.25 g + 10.00 g + 9.6 g = c) 2.36 m + 3.38 m + 0.355 m + 1.06m = d) 0.0853 g + 0.0547 g + 0.037g + 0.00387 g = 28.87 or 29 cm 32.85 or 32.9 g 7.155 or 7.16 m 0.18087 or 0.181 g

  8. 4. Subtract these measurements 23.27 km - 12.058 km = 13.57 g - 6.3 g = c) 350.0 m - 200 m = d) 27.68 cm - 14.369 cm = 11.212 or 11.21 km 7.27 or 7.3 g 150m 13.311 or 13.31 cm

  9. 5. Multiply these measurements 2.6 cm x 3.78 cm = 6.54 m x 0.37 m = c) 0.036 m x 0.02 m = d) 3.08 km x 5.2 km= 9.828 or 9.8 cm2 2.4198 or 2.4 m2 0.00072 or 7 x 10-4 m2 16.016 or 16 km2

  10. Divide these measurements 35 cm  0.62 cm = 39 g  24.2 g = 0.58 dm 2.15 dm = d) 40.8 m  5.050 m = 56.45 or 56 56.45 or 56 0.2697 or 0.27 8.0792 or 8.08

  11. Write the following numbers in Scientific notation. a. 0.0045834 mm b. 438904 s 0.03054 g d. 7004300000 g 4.5834 x10-3 mm 4.37904 x105 s 3.054 x10-2 g 7.004300000 x109 g

  12. Write the following numbers in ordinary notation a. 8.348 x 106 km b. 7.6352 x 10-3 kg c. 3.402 x 103 g d. 3.02 x 10-5 s 8348000 km 0.0076352 kg 3402 mm 0.0000302 s

  13. Convert the following measurements then place them into scientific notation k h da b d c m a. 5.70 g to mg b. 4.37 cm to m c. 783 kg to g d. 45.3 mm to m 10 m to cm f. 0.0015 hg to dg 5700 mg or 5.70 x 103 mg 0.0437 m or 4.37 x 10-2 m 783000 g or 7.83 x 105 g 0.0453 mm or 4.53 x 10-2 mm 1000 cm or 1.0 x 103 cm 1.5 dg

  14. Complete the following addition and subtraction measurement problems. REMEMBER THE RULES • a. 6.23 kL + 5.341 kL =   • b. 3.1 mm + 4.87 mm = • c. 7.5 kg - 5.43 kg = • d. 6.48 mm - 2.8 mm = 11.57 kL 8.0 mm 2.1 kg 3.7 mm

  15. Complete the following multiplication and division measurement problems. REMEMBER THE RULES • 4.8 km X 2.01 km = • b. 15.2 mm X 3.00 mm = • c. 8.421 kg ÷ 2.43 kg = • d. 10.20 mm ÷ 1.120 mm = 9.6 km2 45.6 mm2 3.47 9.107

  16. Why are significant figures so important in scientific data? Using two different instruments, I measured the length of my foot. Ruler #1 measured it to be 22.00 centimeters and ruler #2 had a measurement of 22 centimeters. Explain the difference between the two measurements. The more numbers in your measurement the more precise the measuring tool. Ruler 1 has 4 significant figures in its measurement verse Ruler 2 which has 2. Ruler 1 is more precise than Ruler 2.

  17. Rounding and reading Round 507,209,600 to … (Place in correct scientific notation) 2 S.F. _______________ 4 S.F. ________________ 6 S.F. _________________________ 9 S.F. _______________________ 5.1 x 108 5.072 x 108 5.07210 x 108 5.07209600 x 108

  18. Refer to the following measurement tool. In grams. What is the reading on this scale and underline your uncertainty? How many significant figures are in your measurement? 0.00260 g 3 sig figs

  19. Ch. 2 Sci Numbers Review STUDY FOR P of U