Foundation
USE WHEN
Measured/calculated value differs from actual value; error or correction is asked.
BEST METHOD
Multiplier on Derived Quantity
TARGET
90–120 sec
MASTERY
not started
Measured/calculated value differs from actual value; error or correction is asked.
Percentage error uses the actual/true value as the denominator unless stated otherwise.
If a dimension has multiplicative error, use multipliers for derived quantities.
Apply squared/cubed multipliers for area and volume errors.
Timed drill
Identify the base or invariant before you calculate.
Attempt first · Standard Example
Attempt first · CAT-Level Example
3-level practice ladder
Foundation
CAT Standard
Advanced / Hybrid
measurement-error compounding is a transferable percentage pattern; no exact modern cat mapping asserted.