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5 Common Errors in Primary 4 Maths Fractions: How to Avoid Them

primary 2 mass

Understanding fractions is a crucial part of Primary 4 Maths. Fractions appear in various types of problems, and mastering them is essential for students to progress in their mathematical education. However, there are common errors that students frequently make. This article will explore these errors and provide tips to help students avoid them.

1. Not Simplifying Fractions in the Final Answer

One of the most common errors in Primary 4 maths fractions is not simplifying fractions to their lowest terms or simplifying them incorrectly. Simplifying a fraction involves reducing it to its simplest form, where the numerator and the denominator have no common factors other than 1.


Common Errors in Primary 2 Maths Fractions


Not Simplifying Fractions in the Final Answer
not simplifying fractions
Difficulty in Comparing Fractions

2. Difficulty in Comparing Fractions

Students often have trouble comparing fractions, especially when the denominators are different. They may not understand how to find a common denominator or mistakenly believe that a fraction with a larger numerator or denominator is automatically larger.

Tip: To compare fractions, convert all fractions into mixed numbers. If the whole numbers are identical, adjust the fractions so that their denominators or numerators are the same for easier comparison.


compare fractions, convert all fractions into mixed numbers

Remember to always write the answers as stated in the questions.

3. Confusion Between Improper Fractions and Mixed Numbers

Students often confuse improper fractions (where the numerator is larger than the denominator) with mixed numbers (a whole number and a fraction). They may struggle to convert between the two forms or use them incorrectly in calculations.

Example (Converting mixed numbers to improper fractions):

Converting mixed numbers to improper fractions

Tip: Express the wholes as improper fractions!

Example (Converting improper fractions to mixed numbers):

Converting improper fractions to mixed numbers

Tip: Think - How many wholes is the fraction made up of?

Confusion Between Improper Fractions and Mixed Numbers

4. Adding and Subtracting Without a Common Denominator

Unlike multiplying fractions and dividing, you cannot add or subtract fractions directly unless they have a common denominator. Many students forget to first find a common denominator and adjust the numerators accordingly before adding or subtracting.

Adding and Subtracting Without a Common Denominator

5. Misreading the Number Line

Students might misinterpret the spaces between marks on a fraction number line, thinking that each space represents the same fraction increase (e.g., assuming each space always represents 1/4 without considering the scale of the number line).


Express the mixed number represented by Z on the number line shown.

Misreading the Number Line

Determine the value of each interval by dividing the length between consecutive whole numbers by the number of gaps.

Common mistake: Counting the number of gaps as 8 and putting the denominator as that. The denominator is the number of gaps between 2 consecutive numbers.

Mastering simple math fractions is critical for Primary 4 students. By understanding the common errors and learning how to avoid them, students can improve their proficiency in fractions. Remember to always simplify fractions, find common denominators for addition and subtraction, correctly convert between improper fractions and mixed numbers, and accurately read number lines. With these tips, students will be well-equipped to handle any fraction math challenges they encounter.

Counting the number of gaps as 8 and putting the denominator as that

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AGrader’s Mathematics Curriculum is delivered in a step-by-step teaching approach

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