Jawahar Navodaya Vidyalaya Selection Test (JNVST)
Your gateway to quality education at Jawahar Navodaya Vidyalaya
Calculation Skills: Performing calculations based on data
🚀 Calculation skills are essential for solving problems that involve numbers and data. In the Jawahar Navodaya Vidyalaya Selection Test (JNVST), you may encounter questions that require you to perform calculations based on data presented in charts, tables, or other visual formats. Understanding how to interpret this data and perform accurate calculations is crucial for success.
Examples💡
Example 1: Suppose you have a table showing the prices of different vegetables in a local market. If the price of 1 kg of tomatoes is ₹20, 1 kg of potatoes is ₹15, and 1 kg of onions is ₹25, calculate the total cost of buying 2 kg of tomatoes, 3 kg of potatoes, and 1 kg of onions. Solution: Total cost = (2 kg x ₹20) + (3 kg x ₹15) + (1 kg x ₹25) = ₹40 + ₹45 + ₹25 = ₹110.
Example 2: A line chart shows the daily sales of a shop over a week. If the sales on Monday were ₹500, Tuesday ₹600, Wednesday ₹550, Thursday ₹700, Friday ₹650, Saturday ₹800, and Sunday ₹750, calculate the average daily sales for the week. Solution: Average sales = (₹500 + ₹600 + ₹550 + ₹700 + ₹650 + ₹800 + ₹750) / 7 = ₹4550 / 7 = ₹650.
Example 3: A bar chart displays the number of books read by students in a class over a month. If the chart shows that 5 students read 3 books each, 10 students read 2 books each, and 15 students read 1 book each, find the total number of books read by the class. Solution: Total books = (5 x 3) + (10 x 2) + (15 x 1) = 15 + 20 + 15 = 50 books.
Common Mistakes to Avoid⚠️
- Mistake 1: Misreading the data in charts or tables. Always double-check the labels and units before performing calculations.
- Mistake 2: Forgetting to multiply correctly when calculating totals. Ensure you multiply the quantity by the unit price or value.
- Mistake 3: Not averaging correctly by forgetting to divide by the total number of items or days when calculating averages.