All 10 Numbers, Math & BigInt questions
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Why does 0.1 + 0.2 not equal 0.3 exactly in JavaScript? What does Number.isInteger() check, and how is it different from typeof? What is Number.MAX_SAFE_INTEGER and what breaks beyond it? What is BigInt and how do you create one? Why does 9007199254740993n + 1 throw a TypeError, but 9007199254740993n + 1n does not? Why is Number.parseFloat('123abc') valid but Number('123abc') returns NaN? How do you correctly compare two floating-point numbers for 'close enough' equality? Why is BigInt generally the wrong tool for representing monetary amounts with decimals, like $19.99? How do bitwise operators like >>>, &, and | behave differently on BigInt versus Number?
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JavaScript › Numbers, Math & BigInt

What are some commonly used Math object methods?

Beginner

Answer

Math.round(), Math.floor(), and Math.ceil() handle rounding; Math.max()/Math.min() find extremes among arguments; Math.random() generates a pseudo-random float between 0 (inclusive) and 1 (exclusive); Math.abs() returns absolute value.
Math.round(4.5);   // 5
Math.floor(4.9);   // 4
Math.random();      // e.g. 0.5834...
Math.max(3, 7, 2);  // 7
Real-world example Generating a random integer within a specific range for a dice-roll or ID-suffix generator.

Common follow-ups: How do you generate a random integer between two specific values using Math.random()?

Arrays & Array Methods
All 10 Numbers, Math & BigInt questions