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Metric System

History and prefixes
by

Matthew Wyant

on 17 September 2012

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Transcript of Metric System

What's the buzz about the Metric system? Everything is in 10's! Easy to use! Each unit is 10 x's larger or 10 x's smaller than its neighbors.
Kilo Hecto Deka base deci centi and milli means 1000 x's larger than the base Kilo - k means 100 times larger than the base or 10 times smaller than kilo Hecto - h means 10 times larger than the base or 10 times smaller than hecto! Deka - da means one unit and is 10 times smaller than the deka! Base - gram (g), meter (m), liter (l) Let's find out What's smaller than the base? means one tenth or 0.1 of the base deci - d means one one hundredth or 0.01 of the base centi - c means one one thousandth or 0.001 of the base milli - m Water and Earth! What is the metric system based on? Water is plentiful and the Earth, well, we live on it! Scientists needed a measurement based on something that would never change. The meter The distance from the equator the the North Pole was divided 10 000 000 times to equal one meter! The meter is based on the circumference of the Earth One gram is equal to 1.0 cubic centimeters of water The gram is a little more difficult They massed 1.0 cubic centimeters and set that equal to 1.0 gram! How do I remember all these prefixes in order? Let's wrap it up For this we must go to England! King Henry Died by drinking chocolate milk In England... Henry os for Hecto King is for kilo by is for base Died is for Deka chocolate is for centi drinking is for deci Can you make other diddies as well? and milk is for milli! Glad you asked! How do you convert between units? Which direction are we moving on our number line?
How many places are we moving on our number line? All you do is ask a few questions first... What is the number line? K H Da b d c m Kilo Hecto Deka Base deci centi milli Say we needed to covert 5.0 km to meters.

On our line we would need to move to the right

K H Da base larger smaller From To right K H Da base Next we need to see how many places our unit is from the starting unit. 1 2 3 Start End we will either move the decimal three the right places the right or multiply by 1 and three zeros (1 for each space). As you can see we moved three places to the right therefore 5.0 km = __________ m 5.0 = 5000 . . . 1 2 3 5000 5.0 km x 1000 = 5000 m Or we can multiply remember those three spaces? Simple...we just do the opposite What about moving from small to large units? Say we want to convert 1250 mL to liters base deci centi milli Remember our line? start end left We moved three spaces to the left... We could move the decimal three places or we could divide by 1 with three zeros (one for every move). What do we do now? 1250 mL = ____________ liters? 1250. decimal in whole number is always at the end...like a period 1.250. Moved 3 places to the left You could divide by 1 with three zeros! Or... 1250 / 1000 = 1.250 3 zeros for three spaces 1.250 * One mL of water is defined as 1.0 cc of water too! Let's have a race Finally...are you still partial to the English system? You convert 843 miles to inches while I convert the same number from km to cm....Ready? la la la la... Still working? Makes one wonder doesn't it? Are you convinced yet?
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