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How to add and subtract fractions | Year 4 Mathematics PDF Download

Common Denominators

  • Adding and subtracting fractions is simpler when the denominators are the same.
  • For instance, These are called the denominators.
    How to add and subtract fractions | Year 4 Mathematics

How to add and subtract fractions | Year 4 Mathematics

Equivalent fractions

However, sometimes the denominators are different.
How to add and subtract fractions | Year 4 MathematicsYou can use equivalent fractions to make them the same.
A common multiple of 2 and 3 is 6.
So, for each fraction we need an equivalent fraction with a denominator of 6.
To find the equivalent fraction for 1/2 we need to multiply the numerator and denominator by 3.
How to add and subtract fractions | Year 4 MathematicsAnd to find the equivalent fraction for 1/3 we must multiply the numerator and denominator by 2.How to add and subtract fractions | Year 4 MathematicsNow the denominators are the same we can add them together.How to add and subtract fractions | Year 4 Mathematics

Question for How to add and subtract fractions
Try yourself:
Which of the following is the correct equivalent fraction for 2/5 in order to add it to 1/3?
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FAQs on How to add and subtract fractions - Year 4 Mathematics

1. What are common denominators in fractions?
Ans. Common denominators are numbers that are shared by two or more fractions, making it easier to add or subtract them.
2. How do you find equivalent fractions?
Ans. To find equivalent fractions, you can multiply or divide both the numerator and denominator of a fraction by the same number.
3. How do you add fractions with different denominators?
Ans. To add fractions with different denominators, you first need to find a common denominator by finding the least common multiple of the denominators. Then, you can add the fractions as usual.
4. How do you subtract fractions with common denominators?
Ans. To subtract fractions with common denominators, simply subtract the numerators while keeping the denominator the same.
5. Why are common denominators important when working with fractions?
Ans. Common denominators are important when working with fractions because they allow us to easily compare and combine fractions in calculations such as addition and subtraction.
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