Amicable numbers
Abundant numbers
過剰数
과잉수
过剩数
Simplification (Factors)
Common factors
Greatest common divisor
Friendly numbers
Multiplication
Composite numbers
Number operations
Operasi aritmetika
演算
数字运算
Reciprocals
Prime numbers
Algebraic factors
Divisors
Factorisation
Multiples
5.3 - Mathematical concepts removed, BT Multiplication added.
Factorization
Factors