Mensuration involves measuring physical quantities like length, mass, and capacity. The metric system uses a decimal base, making conversions easy by multiplying or dividing by 10, 100, or 1000.
1. Identify the unit (Meter, Gram, Liter).
2. Convert to a common unit before calculating.
3. Use multiplication for larger to smaller units and division for smaller to larger units.
Used to find the distance between two points. Standard unit: Meter (m).
A wire is 5 meters long. If a piece of 120 cm is cut off, what is the remaining length?
Used to measure how heavy an object is. Standard unit: Gram (g).
A shopkeeper has 10 kg of sugar. He packs them into 250 g packets. How many packets will he make?
Used for measuring the volume of liquids. Standard unit: Liter (L).
Used for exchange of goods. 1 Rupee = 100 Paise.
1. When multiplying by 10, 100, or 1000, just shift the decimal point to the right.
2. Always convert the larger unit to a smaller one to avoid working with difficult decimals.
3. Move decimal right to convert large units to small.
4. Prefix 'Kilo' always means 1000 times the base unit.
1. Forgetting that 1 kg = 1000 g, not 100 g.
2. Adding different units (e.g., adding 5 m to 50 cm without converting).
3. Adding meters to centimeters without converting them to a single unit.
4. Forgetting that 1 liter is 1000 ml, not 100 ml.
Standard units are Meter (length), Gram (mass), and Liter (capacity). Always ensure units match before performing arithmetic. Currency is measured in Rupees and Paise, where 1 Rupee = 100 Paise.
Measurement is essential for shopping, travel, and science. Always remember the units: km, m, cm for length; kg, g, mg for mass; and L, ml for capacity. 1 Rupee equals 100 Paise.