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Chemistry Question 51 – NEET-UG 2026

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The numbers 17.0145 and 21.0235 were rounded to three figures after the decimal point. The resulting numbers, respectively, are

Rounding is a process of approximating a number to a specified number of decimal places or significant figures.

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Ninja Strategy•Consistent Rounding Up

Both original numbers have '5' as their fourth decimal digit, which means both should be rounded up at the third decimal place.

Step 1: Understand the Rounding Rule✦ Active

To round a number to three figures after the decimal point, we examine the fourth digit after the decimal point. If this digit is 5 or greater, we round up the third digit. If it is less than 5, the third digit remains unchanged.

Step 2: Apply to the First Number (17.0145)○ Expand

For the number 17.0145, the third digit after the decimal point is 4. The fourth digit after the decimal point is 5. Since the fourth digit is 5, we round up the third digit (4 becomes 5). Thus, 17.0145 rounded to three decimal places is 17.015.

Step 3: Apply to the Second Number (21.0235) and Select Option○ Expand

For the number 21.0235, the third digit after the decimal point is 3. The fourth digit after the decimal point is 5. Since the fourth digit is 5, we round up the third digit (3 becomes 4). Thus, 21.0235 rounded to three decimal places is 21.024. Combining both results, the rounded numbers are 17.015 and 21.024. This matches option (4).

💡 Teacher's Secret Hint

Always apply the rounding rule consistently to all numbers in the problem.

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