Examples with solutions for Multiplication of Fractions: Using the commutative law

Exercise #1

Solve the exercise using the substitutive property:

12×23×12= \frac{1}{2}\times\frac{2}{3}\times\frac{1}{2}=

Video Solution

Step-by-Step Solution

To solve the problem 12×23×12 \frac{1}{2} \times \frac{2}{3} \times \frac{1}{2} , follow these steps:

  • Step 1: Multiply the numerators

We multiply the numerators of the fractions together: 1×2×1=2 1 \times 2 \times 1 = 2 .

  • Step 2: Multiply the denominators

Similarly, multiply the denominators of the fractions: 2×3×2=12 2 \times 3 \times 2 = 12 .

  • Step 3: Form the resulting fraction

After multiplying the numerators and denominators, we form the fraction: 212 \frac{2}{12} .

  • Step 4: Simplify the fraction

We simplify 212 \frac{2}{12} by finding the greatest common divisor (GCD) of 2 and 12, which is 2. Dividing both the numerator and denominator by 2, we get:

212=2÷212÷2=16 \frac{2}{12} = \frac{2 \div 2}{12 \div 2} = \frac{1}{6} .

Thus, the correct solution is 16 \frac{1}{6} .

Answer

16 \frac{1}{6}

Exercise #2

Solve the exercise using the substitutive property:

35×23×25= \frac{3}{5}\times\frac{2}{3}\times\frac{2}{5}=

Video Solution

Step-by-Step Solution

To solve the exercise 35×23×25 \frac{3}{5} \times \frac{2}{3} \times \frac{2}{5} , we will follow a step-by-step approach:

Step 1: Multiply the numerators:
3×2×2=12 3 \times 2 \times 2 = 12

Step 2: Multiply the denominators:
5×3×5=75 5 \times 3 \times 5 = 75

Step 3: Form the fraction by placing the product of numerators over the product of denominators:
1275 \frac{12}{75}

Step 4: Simplify the fraction. We find the greatest common divisor of 12 and 75, which is 3:
Divide the numerator and the denominator by 3:
12÷375÷3=425 \frac{12 \div 3}{75 \div 3} = \frac{4}{25}

Therefore, the simplified product of the given fractions is 425 \frac{4}{25} .

Answer

425 \frac{4}{25}

Exercise #3

Solve the exercise using the substitutive property:

12×13×12= \frac{1}{2}\times\frac{1}{3}\times\frac{1}{2}=

Video Solution

Step-by-Step Solution

Let's solve this problem step-by-step:

  • Step 1: Multiply the numerators of the fractions. We have 1×1×1=11 \times 1 \times 1 = 1.
  • Step 2: Multiply the denominators of the fractions. We have 2×3×2=122 \times 3 \times 2 = 12.
  • Step 3: Combine the results to form a fraction: 112\frac{1}{12}.
  • Step 4: Simplify the fraction if possible. Since the fraction 112\frac{1}{12} is already in its simplest form, no further simplification is needed.

Thus, the product of 12×13×12 \frac{1}{2} \times \frac{1}{3} \times \frac{1}{2} is 112 \frac{1}{12} .

The correct answer choice is 112\frac{1}{12}, matching choice 4.

Therefore, the solution to the problem is 112 \frac{1}{12} .

Answer

112 \frac{1}{12}

Exercise #4

Solve the exercise using the substitutive property:

24×23×24= \frac{2}{4}\times\frac{2}{3}\times\frac{2}{4}=

Video Solution

Step-by-Step Solution

To solve this problem, we need to multiply the three given fractions:
24×23×24 \frac{2}{4} \times \frac{2}{3} \times \frac{2}{4}

The steps involved in multiplying these fractions are as follows:

  • Step 1: Multiply the numerators. The numerators are 2, 2, and 2. Multiplying these together gives:
    2×2×2=82 \times 2 \times 2 = 8.
  • Step 2: Multiply the denominators. The denominators are 4, 3, and 4. Multiplying these together gives:
    4×3×4=484 \times 3 \times 4 = 48.
  • Step 3: Combine the results to form a new fraction:
    848\frac{8}{48}.
  • Step 4: Simplify the fraction. To simplify 848\frac{8}{48}, we find the greatest common divisor (GCD) of 8 and 48, which is 8. Divide both the numerator and denominator by 8:
    8÷848÷8=16\frac{8 \div 8}{48 \div 8} = \frac{1}{6}.

Therefore, the solution to the given exercise is 16\frac{1}{6}.

Answer

16 \frac{1}{6}

Exercise #5

Solve the exercise using the substitutive property:

13×34×13= \frac{1}{3}\times\frac{3}{4}\times\frac{1}{3}=

Video Solution

Step-by-Step Solution

To solve this problem, follow these steps:

  • Step 1: Identify the fractions to be multiplied: 13 \frac{1}{3} , 34 \frac{3}{4} , 13 \frac{1}{3} .
  • Step 2: Multiply the numerators: 1×3×1=3 1 \times 3 \times 1 = 3 .
  • Step 3: Multiply the denominators: 3×4×3=36 3 \times 4 \times 3 = 36 .
  • Step 4: Write the resulting fraction: 336 \frac{3}{36} .
  • Step 5: Simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor, which is 3: 3÷336÷3=112\frac{3 \div 3}{36 \div 3} = \frac{1}{12}.

The solution to the problem is therefore 112 \frac{1}{12} .

Answer

112 \frac{1}{12}