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Aptitude Topics

Decimal Basics

Decimal fractions are a system of representing fractions using a base-10 structure. Every position to the right of the decimal point represents a power of 10, specifically tenths ($1/10$), hundredths ($1/100$), thousandths ($1/1000$), and so on.

Fundamental Principles

Decimal Point

The separator that distinguishes the whole number part (left) from the fractional part (right).

Place Value

The value of a digit based on its position: $0.1$ is $1/10$, $0.01$ is $1/100$.

Essential Formulation Tips

  • Adding trailing zeros to the end of a decimal (e.g., $0.5 = 0.50 = 0.500$) does not change its value.
  • Always align the decimal points vertically when comparing or performing arithmetic operations.