0.42 + 0.042 + 0.0042 – 0.00042 का योग है:

Question

0.42 + 0.042 + 0.0042 – 0.00042 का योग है:

1. A. 0.42424
2. B. 0.46578 (Correct answer)
3. C. 0.42654
4. D. 0.42528

Correct Answer

Option B — 0.46578

Detailed Solution & Explanation

The correct answer is 0.46578.

Key Points

• 0.42 + 0.042 = 0.462
• 0.462 + 0.0042 = 0.4662
• 0.4662 − 0.00042 = 0.46578

Exam Tip

• Pad every number to the same number of decimal places before adding or subtracting — here five places — and the arithmetic becomes mechanical.

Additional Information

• Written with equal padding: 0.42000 + 0.04200 + 0.00420 − 0.00042.
• A fast sanity check: the total must sit just below 0.4662, since only a small quantity is subtracted — that alone rules out 0.42424, 0.42654 and 0.42528.
• Place-value reminder: the digits after the point are tenths, hundredths, thousandths, ten-thousandths, hundred-thousandths.