# SI Prefixes AKA Metric Prefixes Common Useful Prefixes

• Slides: 13

SI Prefixes AKA Metric Prefixes

Common Useful Prefixes Prefix Symbol Sci Not n n n n n micro milli centi deci deka hecto kilo mega m m c d da h k M You are expected to know these 10 -6 10 -3 10 -2 10 -1 102 103 106

Using Prefixes How do you express one-hundredth of a meter? What do you call it? 10 -2 m is a centimeter (cm) Recall: (1/100) of a dollar is a cent

Using Prefixes What do you call 1000 meters? A kilometer How is it written? 103 m or km

Using Prefixes What do you call a million grams? A megagram How is it written? 106 g = Mg

Using Prefixes What do you call a millionth of a second? A microsecond How is it written? 10 -6 sec or ms

Using Prefixes What do you call 106 phones? A megaphone! <<<>>> How would you write “microphone” using an SI prefix? 10 -6 phones LOL!

Using Prefixes -2 What do you call 10 pedes? A centipede!

Using Prefixes -9 How about 10 goats? -9 10 a billionth or is a “nano” 10 -9 goats = a nanogoat

A Useful Prefix Chart 106 --103 102 101 100 10 -1 10 -2 10 -3 --10 M k h da mass d c m m length vol Kingwood High does math during class Monday 3. 45 m = ? cm solve using the above c is 2 steps to right of meter ANS: 3. 45 x 102 cm

A Useful Prefix Chart 106 --103 102 101 100 10 -1 10 -2 10 -3 --10 M k h da mass d c m m length vol 952 mm = ? m solve using the above m is 3 steps to left of mm ANS: 0. 952 m

A Useful Prefix Chart 106 --103 102 101 100 10 -1 10 -2 10 -3 --10 M k h da mass d c m m length vol 0. 735 km = ? cm solve using the above cm is 5 steps to right of km ANS: 0. 735 x 105 cm =? in Sci Notation = 7. 35 x 104 cm =73, 500 cm

Use the track method to calculate how many cm are in 54 km 1000 m 100 cm 1 km 1 m ANS: 54 x 105 cm Recall: km to m & then m to cm Move from prefix unit to fundamental unit, then Move from fundamental to other prefix unit Can you write it in scientific notation? As a regular number? 5. 4 x 106 cm or 5, 400, 000