Measurements& S.I. Units Systeme Internationale d’Unites International System of Units

Always write your units!! I weigh 68,181 Always write your units!! Units!!?? Give meaning to numbers Write unit (grams)

Liters (L) or Meters cubed (m3) Gram (g) Meter (m) LENGTH VOLUME MASS Distance from one end of an object to the other end How much SPACE an object takes up How much MATTER an object has Liters (L) or Meters cubed (m3) Gram (g) Meter (m)

Practice measuring length Measuring your hand Practice measuring length 16.9 cm my hand

S.I. over American system Used by scientists world wide Much easier to convert -- based on units of 10

Prefixes used example: centimeter 1 Centi means 0.01 or 100 Discuss what a “prefix” is. Have students look at meter sticks set on tables. Show them one cm. How many centimeters are in 1m? Write using smart board

Common prefixes for S.I. units Conversion Factor 1 2 3 KILO 1000 Units HECTO 100 Units DEKA 10 Units DECI 0.1 Unit Meters Liters Grams CENTI 0.01 Unit Fill in chart MILLI 0.001 Unit

Bigger Number? ____km =____m ____hg = ____mg ____cL = ____mL

Conversion Practice Now convert your hand measurement from centimeters to meters Convert 16.9 cm to meters to millimeter. Have students draw own hand and find length

Practice converting! Compare using <, >, or =. 63 cm 6 m 5 g 508 mg 1,500 mL 1.5 L 536 cm 53.6 dm 43 mg 5 g 3.6 m 36 cm