Solve Mixed Number Division: 3½ ÷ 1¼ Step-by-Step

Question

312:114= 3\frac{1}{2}:1\frac{1}{4}=

Video Solution

Step-by-Step Solution

To solve the problem 312:114 3\frac{1}{2} : 1\frac{1}{4} , we will follow these steps:

  • Step 1: Convert each mixed number to an improper fraction.
  • Step 2: Divide the improper fractions by multiplying by the reciprocal of the second fraction.
  • Step 3: Simplify the resulting fraction if possible.
  • Step 4: Convert the simplified improper fraction back to a mixed number if needed.

Let's work through each step:

Step 1: Convert 312 3\frac{1}{2} to an improper fraction.

312=(3×2)+12=6+12=72 3\frac{1}{2} = \frac{(3 \times 2) + 1}{2} = \frac{6 + 1}{2} = \frac{7}{2}

Convert 114 1\frac{1}{4} to an improper fraction.

114=(1×4)+14=4+14=54 1\frac{1}{4} = \frac{(1 \times 4) + 1}{4} = \frac{4 + 1}{4} = \frac{5}{4}

Step 2: Divide 72 \frac{7}{2} by 54 \frac{5}{4} .

The division of fractions is done by multiplying by the reciprocal: 72×45 \frac{7}{2} \times \frac{4}{5} .

Step 3: Perform the multiplication.

7×42×5=2810 \frac{7 \times 4}{2 \times 5} = \frac{28}{10}

Step 4: Simplify 2810 \frac{28}{10} .

Divide both the numerator and the denominator by 2: 28÷210÷2=145 \frac{28 \div 2}{10 \div 2} = \frac{14}{5} .

Convert 145 \frac{14}{5} back to a mixed number.

145=245 \frac{14}{5} = 2\frac{4}{5} because 14 divided by 5 is 2 with a remainder of 4.

Therefore, the solution to the problem 312:114 3\frac{1}{2} : 1\frac{1}{4} is 245 2\frac{4}{5} .

Answer

245 2\frac{4}{5}