Chapter 3 · Class 7 CBSE · Formula Sheet
Decimals Formulas — Class 7 CBSE
Read, compare, and perform operations on decimal numbers in real-world contexts.
Key Formulas
Multiplication of Fractions
\dfrac{a}{b} \times \dfrac{c}{d} = \dfrac{a \times c}{b \times d}
Reciprocal
\text{Reciprocal of } \dfrac{a}{b} = \dfrac{b}{a}
Division of Fractions
\dfrac{a}{b} \div \dfrac{c}{d} = \dfrac{a}{b} \times \dfrac{d}{c}
Multiplication of Decimals
\text{Multiply as whole numbers, count total decimal places}
Division of Decimals
\text{Move decimal point to make divisor whole, then divide}
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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