8th Grade · Expressions & Equations
LCD
8.EE.C.7b
Definition
The least common denominator, the smallest multiple shared by all denominators. Multiplying every term of an equation by the LCD clears the fractions.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- Denominators 2, 3, 6 have LCD = 6.
- Multiply every term by the LCD, including whole numbers.
Key rule
Multiply every term, not just the fractions.
Memory hook
Clear the fractions by multiplying by the LCD.