Understanding Fraction Subtraction
Fractions can be tricky, but models make them easier to
understand!
When fractions have different denominators (the bottom numbers), we can't subtract them directly. First,
we need to find a common denominator and create equivalent fractions. Visual models help us see exactly
what's happening when we subtract fractions!
How to Subtract Fractions with Models
1️⃣ Find a common denominator - The smallest number both denominators divide into
2️⃣ Create equivalent fractions - Draw models showing both fractions with the new denominator
3️⃣ Subtract the numerators - Count how many parts are left after subtraction
Let's Practice Together!
Example 1: \(\frac{3}{4} - \frac{1}{2}\)
Let's subtract these fractions using rectangle models:
The common denominator is 4 because both 4 and 2 divide into 4.
Great job! The answer is \(\frac{1}{4}\).
Example 2: \(\frac{5}{6} - \frac{1}{3}\)
This time let's use circle models (pizzas!) to subtract:
The common denominator is 6 because both 6 and 3 divide into 6.
\(\frac{1}{3}\) is the same as \(\frac{2}{6}\) when we use sixths!
Awesome! \(\frac{5}{6} - \frac{2}{6} = \frac{3}{6}\), which simplifies to \(\frac{1}{2}\).
Parent Tips 🌟
- Use real-world objects like pizza slices, chocolate bars, or measuring cups to make fraction subtraction tangible and fun.
- Encourage drawing - Have your child sketch fraction models before solving problems to build visual understanding.
- Connect to addition - Remind them that finding common denominators works the same way for both operations.