Whole (natural) numbers

Arithmetical operations

Order of operations. Brackets

Laws of an addition and a multiplication

Divisibility criteria

Prime and composite numbers

Factorization. Resolution into prime factors

Greatest common factor

Least common multiple

Vulgar (simple) fractions

Operations with vulgar fractions

Decimal fractions (decimals)

Operations with decimal fractions

Converting a decimal to a vulgar fraction and back

Percents

Ratio and proportion. Proportionality

Problems: Arithmetic