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A water tank in a Chennai apartment holds 1,000 litres when full. On Monday 348 litres were drawn out and on Tuesday another 275 litres. How many litres are left?

Class 6Whole NumbersWhole Numbers
  • A623
  • B725
  • C1,623
  • D377

Step-by-Step Solution

Add the two amounts used first, grouping them with the associative property: 348 + 275 = 623 litres. Then 1,000 - 623 = 377 litres remain. Stopping at 623 reports the water USED rather than the water left, and 725 comes from subtracting only Tuesday.
Answer: D) 377

Key idea: From counting to whole numbers

Natural numbers (1, 2, 3, …) answer 'how many?' when there is at least one of something. But what if there are none? You need a number for that — and that number is zero. Adding 0 to the natural numbers gives the whole numbers: 0, 1, 2, 3, …. Every whole number sits at a fixed point on the number line, and they never run out — for any whole number you pick, there is always a larger one.

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