- A504
- B540
- C468
- D50
Step-by-Step Solution
The counted block has fans. There are blocks, but one is closed, so 14 are full: . (540 forgets the closed block; 468 also leaves out the counted block; 50 adds instead of multiplying.)
Answer: A) 504
A stand at a cricket stadium in Kolkata is divided into equal blocks. The fans in the orange-bordered block are drawn as dots. Every other open block is about as full; one block is closed. Estimate the number of fans in the stand.
Class 6Whole NumbersWhole Numbers
Key idea: Closure: when an operation 'stays inside' the whole numbers
Adding two whole numbers always gives a whole number — addition is **closed** on whole numbers. Multiplying two whole numbers always gives a whole number — multiplication is **closed** too. But subtraction is **not** closed: 5 − 7 = −2, which is not a whole number. Division is also not closed: 7 ÷ 2 = 3.5, not a whole number. Closure is the property that lets us trust an operation never to take us 'outside' the world of whole numbers.
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