Solve: Multiplying Algebraic Fractions (9m/3m² × 3m/6)

Algebraic Fraction Multiplication with Variable Terms

9m3m2×3m6= \frac{9m}{3m^2}\times\frac{3m}{6}=

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1

Understand the problem

9m3m2×3m6= \frac{9m}{3m^2}\times\frac{3m}{6}=

2

Step-by-step solution

According to the laws of multiplication, we must first simplify everything into one exercise:

9m×3m3m2×6= \frac{9m\times3m}{3m^2\times6}=

We will simplify and get:

9m2m2×6= \frac{9m^2}{m^2\times6}=

We will simplify and get:

96= \frac{9}{6}=

We will factor the expression into a multiplication:

3×33×2= \frac{3\times3}{3\times2}=

We will simplify and get:

32=1.5 \frac{3}{2}=1.5

3

Final Answer

0.5m 0.5m

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply numerators together, then denominators together before simplifying
  • Technique: Cancel common factors like m2 m^2 from numerator and denominator
  • Check: Substitute a value for m to verify: when m=2, both expressions equal 1 ✓

Common Mistakes

Avoid these frequent errors
  • Not simplifying before multiplying
    Don't multiply 9m×3m=27m2 9m \times 3m = 27m^2 and 3m2×6=18m2 3m^2 \times 6 = 18m^2 first = harder work and potential errors! This creates unnecessarily large numbers. Always look for common factors to cancel before multiplying.

Practice Quiz

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\( 9+3-1= \)

FAQ

Everything you need to know about this question

Why did the explanation get 1.5 but the answer shows 0.5m?

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There's an error in the given explanation! It incorrectly canceled all the m variables. The correct solution keeps one m: 9m×3m3m2×6=27m218m2=2718m=32m \frac{9m \times 3m}{3m^2 \times 6} = \frac{27m^2}{18m^2} = \frac{27}{18m} = \frac{3}{2m} , but this doesn't match either answer.

How do I know which terms to cancel?

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Look for identical factors in both numerator and denominator. In this problem, you can cancel m2 m^2 terms, but be careful not to cancel variables that appear with different powers!

Can I cancel numbers and variables separately?

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Yes! Cancel numerical factors first: 9×33×6=2718=32 \frac{9 \times 3}{3 \times 6} = \frac{27}{18} = \frac{3}{2} , then handle variables: m×mm2=m2m2=1 \frac{m \times m}{m^2} = \frac{m^2}{m^2} = 1

What's the difference between 0.5m and 1.5?

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These are completely different! 0.5m means "half of m" (contains a variable), while 1.5 is just a number. The correct answer should contain m since the original problem has variables.

How can I check my work with variables?

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Pick any value for the variable (like m=2) and substitute it into both the original expression and your answer. If they give the same result, you're correct!

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