How to Divide a Fraction in Half

How to Divide a Fraction in Half
••• merc67/iStock/GettyImages

Cooking requires a firm grasp of fractions due to the measuring required to follow a recipe correctly. Whether you are following a recipe or have another reason for halving a fraction, if you need to divide a fraction in half, the process is remarkably simple. Follow the basic formula for dividing a fraction by two, and you can then continue with your mission -- culinary or otherwise.

    Write the fraction you wish to divide on a sheet of paper.

    Create a simple multiplication problem to half the fraction. For example, if you wish to halve the fraction 5/7, write “* 2” beside the denominator “7.” There is no operation to perform to the numerator.

    Multiply the denominator by 2 to halve the fraction. Using the same example, 7 * 2 = 14. This means that half of 5/7 is 5/14.

    Tips

    • To halve a mixed number, determine whether the whole number is even or odd. If the whole number is even, divide it in half and multiply the denominator of the fraction by 2. For example, to halve 4 3/5, divide 4 / 2 = 2. Multiply 5 * 2 = 10. The answer is 2 3/10. If the whole number is odd, divide it in half and round the decimal down to the nearest whole number. Add the numerator and denominator of the fraction together to get the new numerator. Multiply the old denominator by 2 to get the new denominator. For example, to halve 3 1/2, divide 3 / 2 = 1.5 (round down to 1). Add 1 + 2 = 3. Multiply 2 * 2 = 4. The answer is 1 3/4.

Related Articles

How to Convert a Fraction to a Ratio
How to Divide Rational Numbers
How to: Improper Fractions Into Proper Fractions
How to Calculate the Percentage of Another Number
How to Convert Decimals Into Feet, Inches and Fractions...
How to Estimate With Fractions
How to Find the Product of Fractions
How to Change a Ratio Into a Decimal
How to Calculate Half a Percent on a Calculator
How to Subtract, Add & Simplify Fractions
How to Take the Natural Log of a Fraction With X in...
How to Do Fractions on a TI-30X IIS
How to Get the Fraction Equivalent of a Whole Number
How to Find the Fractional Part of a Number
How to Fill in Missing Numbers for Fractions
How to Make a Fraction Equivalence Chart
How to Figure a Percentage of a Whole Number
How to Write a Ratio in Different Ways
How to Multiply 3 Fractions
How to Calculate Two Thirds of a Number