MathematicsClass 7Fractions and Decimals
Application of Decimals
Solving real-world word problems involving units of measurement like money, length, and weight.
Class 7 · MathematicsCBSE & ICSE
Definition
Application of decimals involves using decimal numbers to solve real-world problems related to money, length, weight, and capacity. It requires converting units, such as centimeters to meters or paise to rupees, and performing basic arithmetic operations with these quantities.
Key formula
1 rupee = 100 paise; 1 meter = 100 centimeters; 1 kg = 1000 grams
Worked examples
1
Convert 5 rupees 50 paise into rupees using decimals: 5.50 rupees
2
Find the total cost of 2.5 kg of potatoes if 1 kg costs 20.50 rupees: 2.5 times 20.50 = 51.25 rupees
3
Convert 45 cm into meters using decimals: 0.45 meters
Common mistakes
- • Incorrectly converting units, such as writing 5 paise as 0.5 rupees instead of 0.05 rupees.
- • Failing to include proper units in the final answer of a word problem.