Stage 3 · Fractions & Decimals

3.2.3 Common Multiples and the Common Denominator

3.2 Different Looks for the Same Amount: Equivalence, Reducing, and Common Denominators

Point 3 of 5

3.2.3 Common Multiples and the Common Denominator

Core idea

To line up two kinds of grid you need a number of fine cells they can share — that shared count is the common denominator (the least common multiple).

Module goal. Understand that "cutting finer makes more parts but the same amount," and master equivalent fractions, reducing to lowest terms, and finding common denominators for comparing and calculating.

eastmath.com · 3.2 Different Looks for the Same Amount: Equivalence, Reducing, and Common Denominators · 3.2.3 Common Multiples and the Common Denominator