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Suitable for: Primary 3 and above

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

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.

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.

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