Rounding simplifies numbers with many significant figures. Rounding helps with quick estimations and informed decision-making. Numbers can be rounded to whole numbers, decimal places, or higher
Significant figures are digits used to express a number to required accuracy. First non-zero digit is most important for expressing number size. Zeros between non-zero digits are significant. Trailing zeros only significant with decimal points
Java uses float and double for decimal numbers. BigDecimal class recommended for precise values like currencies. Math.round() method truncates values by multiplying/dividing by 10^n
ROUNDUP rounds numbers up to specified decimal places. Function falls under Math & Trig category in Excel Function Library. Both number and num_digits arguments are mandatory
.2f format specifier is simplest way to print numbers with two decimal places. round() function allows rounding numbers to specified decimal places. f-strings introduced in Python 3.6 for modern string formatting. format() method provides direct format specification within strings
Math.round rounds up when fraction is ≥ 0.5, down otherwise. Math.ceil always rounds up, Math.floor always rounds down. Math.toFixed can format numbers but may not round correctly