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Subtracting Fractions Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Subtracting fractions with the same denominator
Keep the denominator the same and subtract the numerators.
Subtracting fractions with different denominators
Find a common denominator, rewrite the fractions with this denominator, then subtract the numerators.
Finding a common denominator
Use the lowest common multiple (LCM) of the denominators as the common denominator.
Simplifying the result
After subtracting, simplify the fraction by dividing the numerator and denominator by their highest common factor (HCF).
Mixed numbers subtraction
Convert mixed numbers to improper fractions, subtract them, and convert back to a mixed number if needed.
Improper fractions subtraction
Subtract the fractions as usual, ensuring the denominators are the same, and simplify if possible.
Subtracting a fraction from a whole number
Write the whole number as a fraction with the same denominator as the fraction, then subtract.
Negative fractions in subtraction
Follow the rules of subtracting negative numbers: subtracting a negative fraction is the same as adding its positive equivalent.
Checking subtraction of fractions
Use the inverse operation (addition) to check if the result is correct.
Subtracting fractions in word problems
Carefully interpret the problem, write the fractions, find a common denominator if needed, subtract, and simplify the result.

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