Arithmetic/Truncating
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Truncating is a simpler version of rounding. Digits are just dropped; whether the digit to the right of the one left is greater than 5 is ignored.
[edit] Examples
What is 98.57 truncated to the tenths place?
The 7 in the hundredths place is dropped. The answer is 98.5.
Truncate 33.504 to the units place.
All digits to the left of the units place (3) are dropped. the answer is 33.