Unit 3 · Class 6 IB MYP · Formula Sheet
Fractions & Decimals Formulas — Class 6 IB MYP
Convert between fractions and decimals and perform operations in real-world contexts.
Key Formulas
Adding Fractions
\dfrac{a}{b} + \dfrac{c}{d} = \dfrac{ad + bc}{bd}
Subtracting Fractions
\dfrac{a}{b} - \dfrac{c}{d} = \dfrac{ad - bc}{bd}
Equivalent Fractions
\dfrac{a}{b} = \dfrac{a \times k}{b \times k}
Decimal-Fraction Conversion
0.75 = \dfrac{75}{100} = \dfrac{3}{4}
Worked Examples
1Using: Addition of Fractions
Add 2/5 + 3/10.
Step 1: LCM of 5 and 10 = 10.
Step 2: 2/5 = 4/10.
Step 3: 4/10 + 3/10 = 7/10.
Answer: 7/10
2Using: Mixed to Improper
Convert 3 1/4 to an improper fraction.
Step 1: = (3 x 4 + 1) / 4
Step 2: = 13/4.
Answer: 13/4
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