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Fraction: Addition & Subtraction

Suitable for: Primary 3 and above
Prerequisite: Factors & Multiples, Fraction Anatomy


Are fractions causing you frustration? Are you puzzled by the intricacies of adding and subtracting fractions? Don’t worry – we’ve got your back! In this quick and easy guide, we’ll walk you through the fundamental steps to effortlessly conquer fraction addition and subtraction. And guess what? It’ll only take a minute of your time!

But before you dive in, make sure to check out our accompanying tutorial video: “Take One Minute to Ace Fraction Addition and Subtraction”.

Step 1: Making Common Denominators

The first key to mastering fraction addition and subtraction is ensuring that all the fractions share common denominators.

Step 2: Adding / Subtracting the Numerators

Once you have established common denominators, the next step is to add or subtract the numerators of the fractions, noting that you only need to focus on the numerators. Leave the denominators untouched – they remain constant throughout the process.

Adding or Subtracting Fractions with Uncommon Denominators

Situation #1: Partial Fraction Change

What if the fractions you’re working with don’t share a common denominator? If one fraction’s denominator is a factor of the other’s, you simply have to do a partial fraction change. This allows you to align the denominators and proceed with making the addition or subtraction process.

Situation #2: Uncommon Denominator (All Fraction Change)

But what if neither fraction’s denominator is a factor of the other’s? Simply change both the denominator to the lowest common multiple.

That's All For Now!

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