We learn all of the *essentials*, when *working with numbers*: *factors*, *multiples*, *hcf*, *lcm*, *prime factors*, *prime factorization*, *fractions*, *powers of numbers*, *simplifying roots*, *percentages*, ... .

Factors and Multiples and how to find them

Least Common Multiple, LCM, and Highest Common Factor, HCF (a.k.a GCD)

Prime Factors & Prime Factorization

HCF and LCM, using Prime Factorization

Equivalent Fractions

Simplifying Fractions

Adding & Subtracting Fractions - Method 1: using a Formula

Adding & Subtracting Fractions - Method 2: Least Common Multiple i.e. Least Common Denominator

Multuplying & Dividing Fractions