Aviation Mechanic - General, Airframe, and Powerplant › I. General › Task H. Mathematics

AM.I.H.K9

Knowledge

Rounding numbers.

Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - General p. 3-6
Chapter 3: Mathematics in Aviation Maintenance › The Decimal Number System › Rounding Off Decimal Numbers
Rounding Off Decimal Numbers Occasionally, it is necessary to round off a decimal number to some value that is practical to use. For example, a measurement is calculated to be 29.4948 inches. To use this measurement ... process of “rounding off.” A decimal is “rounded off” by keeping the digits for a certain number of places and discarding the rest. The degree of accuracy desired determines the number of digits to be retained. When the digit immediately…
Aviation Maintenance Technician Handbook - General p. 3-7
Chapter 3: Mathematics in Aviation Maintenance › The Decimal Number System › Converting Decimal Numbers to Fractions
reamed to a diameter of 0.763 inches? First, multiply the 0.763 decimal by 64. Next, round the product to the nearest whole number: 48.832 ≈ 49. Use this number (49) as the numerator and 64 as the denominator ... This decimal can be represented with a bar, or can be rounded. (A bar indicates that the number(s) beneath it are repeated to infinity…
Aeronautical Information Manual p. 4-2-6
Chapter 4. Air Traffic Control › Section 2. Radio Communications Phraseology and Techniques › 4-2-8. Figures
Phonetic Alphabet/Morse Code 4-2-8. Figures a. Figures indicating hundreds and thousands in round number, as for ceiling heights, and upper wind levels up to 9,900 must be spoken in accordance with the following. EXAMPLE-1. 500 . . . . . . . . five…