The household and metric conversion facts the HESI A2 math subtest expects you to know cold, with the clinical shortcuts that make the calculations fast.
ObjectiveM.5.1Read5 minExam weightMeasurement and Conversions ≈ 12% of Mathematics
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Convert between metric units (kilometres, metres, centimetres, millimetres; kilograms, grams, milligrams; litres, millilitres) without a reference sheet.
Convert between household or English units (miles, yards, feet, inches; gallons, quarts, pints, cups, ounces; pounds, ounces, tons) and across the metric line (pounds to kilograms, ounces to millilitres, inches to centimetres).
Set up a conversion as a single multiplication or division step and check that the answer's size makes sense.
What the lesson concludes
The metric system moves by powers of ten, so every metric conversion is a decimal shift, not long division.
Household units do not move by ten, so you must memorise the exact conversion factors rather than guess them.
Four bridge facts carry almost every metric to household question on this exam: 2.2 pounds per kilogram, 30 millilitres per ounce, 2.54 centimetres per inch, and 1 kilogram per 1,000 grams.
Always ask whether your unit is getting bigger or smaller. If it is getting bigger, you divide. If it is getting smaller, you multiply.