Why was the broom late Because he overswept
Why was the broom late? Because he over-swept!
• • Units of Measurements use equipment (ruler, thermometer, etc. ) Calculations only done with numbers and units (2 in + 2 in = 4 in)
Units of Measurement • Measurements are meaningless without units. Property Base Units (what’s measured) • • Length Mass Time Volume (how it’s measured) meters (m) grams (g) seconds (s) liters (L)
Units of Measurement (Don’t Copy) • SI = “Le Systeme International d’Unites” • • “the metric system” Based on factors of 10
SI prefixes (p. 130) prefix abbr. conversion factor mega- M 106 kilo- K 1, 000 -----Base Unit----------centi- c 0. 01 milli- m 0. 001 micro- m 10 -6
Mega Kilo Base unit milli micro
Units of Measurement To convert: Move decimal right to get smaller units Ex: 1 g = 1000 mg 4. 3 g = 4. 3 mg = 4, 300 mg 0. 67 L = ____m. L
Units of Measurement Move left to get larger units Ex: 21 g = 21 Kg = 0. 021 Kg 770 m = ____Km
Units of Measurement Practice! Convert the following 1. 0. 043 Kg = _______g 2. 5. 17 m = _______Km 3. 3, 670 mg = _______g 4. 2, 500 L = _______m. L 5. 0. 051 Ks = _______ms 6. 529 mg = _____ Kg 7. 2. 4 x 105 cm = _______Km
Units of Measurement Practice! Convert the following (Honors only) 0. 00451 s = _______ms 2. 3. 4 x 106 mg = _____ Mg 3. 45 cm = _______mm Practice! Calculate the following 1. 0. 32 Km + 80 m = 2. 1. 5 g – 500 mg = 3. 2. 5 x 104 mm + 16 cm = 1.
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