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Published byCharity Cush Modified over 2 years ago

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International System of Units (SI)

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► Measurement = # and unit Ex: Miss. Pitre ran 10 km ► Base unit of length is the metre (m) ► “ “ “ mass is the gram (g) ► “ “ “ volume the litre (L) SI Handout SI Handout

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Prefixes ► Part of word found before base unit m = milli multiply base unit by 1000 c = centi “ “ “ “ 100 d = deci “ “ “ “ 10 da = deca divide base unit by 10 h = hecto “ “ “ “ 100 k = kilo “ “ “ “ 1000

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Do the following m = _____ km g = _____ cg L = _____ daL m = _____ mm

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Multiplication trick ► When multiplying by 10, 100, 1000… Add as many zeros to the # as 10, 100, has ► Ex: 356 x 1000 = Move the decimal to the right by the # of zeros in 10, 100, 1000… ► Ex: x 100 = ► Do these: 3746 x 100 = x =

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Division trick ► When dividing by 10, 100, 1000… Take away as many zeros to the # as 10, 100, 1000… has ► Ex: ÷ 10 = Move the decimal to the left by the # of zeros in 10, 100, 1000… ► Ex: ÷ = ► Try these: ÷ 100 = ÷ =

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Multiplying/Dividing by Decimals ► Multiplying by 0.1 is like dividing by 10 ► “ “ 0.01 “ “ “ “ 100 ► “ “ “ “ “ “ 1000 ► Dividing by 0.1 is like multiplying by 10 ► “ “ 0.01 “ “ “ “ 100 ► “ “ “ “ “ “ 1000

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x 0.01 = ÷ = x 0.1 = ÷ 0.1 =

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