Year 6 Exam  >  Year 6 Notes  >  Year 6 Mathematics  >  Add and subtract fractions

Add and subtract fractions | Year 6 Mathematics PDF Download

Common Denominators

  • Adding and subtracting fractions is simple when the numbers on the bottom are the same.
  • These numbers are called the denominators.
    Add and subtract fractions | Year 6 Mathematics

Question for Add and subtract fractions
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What is the common denominator required to add 1/4 and 1/3?
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Equivalent Fractions

  • Sometimes fractions have different denominators, requiring us to find equivalent fractions to add or subtract them.
  • For example, Add and subtract fractions | Year 6 Mathematics
  • A common multiple of 2 and 3 is 6, so we aim to get both fractions to have a denominator of 6.
  • To do this, we find equivalent fractions. For 1/2, we multiply both numerator and denominator by 3: This gives us 3/6.
  • For 1/3, we multiply both numerator and denominator by 2: This results in 2/6.
  • Now that the denominators are the same (6), we can add the fractions together: Add and subtract fractions | Year 6 Mathematics

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FAQs on Add and subtract fractions - Year 6 Mathematics

1. How do you add fractions with different denominators?
Ans. To add fractions with different denominators, you first need to find a common denominator. You can do this by finding the least common multiple (LCM) of the denominators. Once you have a common denominator, you can add the fractions by adding the numerators and keeping the denominator the same.
2. How do you subtract fractions with different denominators?
Ans. To subtract fractions with different denominators, you need to find a common denominator just like when adding fractions. Once you have a common denominator, you can subtract the fractions by subtracting the numerators and keeping the denominator the same.
3. What is the simplest form of a fraction?
Ans. The simplest form of a fraction is when the numerator and denominator have no common factors other than 1. This means that the fraction cannot be further reduced or simplified.
4. How can you check if your addition or subtraction of fractions is correct?
Ans. You can check if your addition or subtraction of fractions is correct by converting the fractions to a common denominator, performing the operation, and then simplifying the result to its simplest form. You can also cross-check your answer by reversing the operation (subtraction for addition and vice versa) to ensure that you get back to the original fractions.
5. Can fractions with different denominators be added or subtracted without finding a common denominator?
Ans. No, fractions with different denominators cannot be added or subtracted without finding a common denominator. Without a common denominator, you cannot perform the arithmetic operation accurately.
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