MAPPING YOUR MIND 1.2 Common language Systems of measurement Metric system (or SI) Multiples of ten Reading numbers and formulae . , No specific pattern of conversion + US Customary system Electrical tools Cutting Separates decimals Power drill Hacksaw Chuck for Wire cutters Separates thousands, millions, billions Imperial system Derived from imperial system Hand tools Plus Sanding Hand sander Gripping, bending, manipulating x or . Times : Inserting, removing, tightening Screwdriver Different tips Slot flared Divided by Slot parallel Exponentiation Torx Squared Cubed To the power of Fractions Numerator: cardinal number Denominator: ordinal number With symbols: over Percentage Percent Decimals Read separately Read like normal numbers in prices 0 Nought before decimal point Oh after decimal point Zero for temperatures Screwdriver tip Soldering iron Reciprocating saw Angle grinder Pliers Minus Drill bit Phillips head Spanner Two ends Fixed-end Adjustable Sander