Adding and Subtracting Fractions with Variables
When adding or subtracting fractions with variables, treat the variables as if they were prime numbers.
Examples
16t = 2 · 2 ·
2 · 2 · t and 12 = 2 · 2 · 3
so the LCD = 2 · 2 · 2 · 2 · 3 ·
t
= 48t
48t ÷ 16t = 3
and 48t ÷ 12 = 4t
84 = 2 · 2 ·
3 · 7 and 30x = 2 · 3 · 5 · x
LCD = 2 · 2 ·
3 · 5 · 7 · x = 420x and
420x ÷ 84 = 5x
and 420x ÷ 30x = 14
Practice
Do not try
to reduce your solutions. We will learn how to reduce fractions like these in a
later chapter.
Solutions
“Sumber Informasi”
Labels:
Mathematician
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