Measurement Notes

Measurement: compare an unknown value with a known value using standard units We use the metric system so we can communicate internationally

Precision Degree of exactness. Same result over and over again The smaller the units on a tool the greater the precision

Low accuracy Low precision High precision High accuracy

Measuring The more decimal places you have in an answer the more precise the instrument is Ruler: length (cm) 2 decimal places Beaker: volume (mL): whole # 100mL graduated cylinder: 1 decimal 10mL graduated cylinder: 2 decimal

Conversion practice 1000mg= ________g 2. 14kg = ________g 3. 160cm= ________mm

How many jumps does it take? Ladder Method 1 2 3 KILO 1000 Units HECTO 100 Units DEKA 10 Units DECI 0.1 Unit Meters Liters Grams CENTI 0.01 Unit MILLI 0.001 Unit How do you use the “ladder” method? 1st – Determine your starting point. 2nd – Count the “jumps” to your ending point. 3rd – Move the decimal the same number of jumps in the same direction. 4 km = _________ m Starting Point Ending Point How many jumps does it take? 4. 1 __. 2 __. 3 __. = 4000 m