CLASS 6 MATHS · KNOWING OUR NUMBERS

Rounding off and estimation

Look at the digit just right of the rounding place: 5 or more rounds up, less than 5 rounds down.

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Worked examples

Example 1 · level 1

Round 4,047 to the nearest hundred.

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4,047 is between 4,000 and 4,100.
The next digit is 4 (less than 5: round down).
Answer: 4,000.

Answer: 4,000

Example 2 · level 2

Round 6,56,753 to the nearest thousand.

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6,56,753 is between 6,56,000 and 6,57,000.
The next digit is 7 (5 or more: round up).
Answer: 6,57,000.

Answer: 6,57,000

Example 3 · level 3

Aarav's school in Patna sold 8,312 tickets on day 1 and 6,995 on day 2 of its Pongal fair. Estimate the total by rounding each to the nearest hundred.

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8,312 ≈ 8,300, 6,995 ≈ 7,000.
Estimate = 8,300 + 7,000 = 15,300.

Answer: 15,300