Mathematics for IGCSE & O level - Estimation (Section 2 - No. 47)
When is estimation a useful technique?
When a precise answer is needed.
When a quick approximate answer is required.
To check the reasonableness of a calculated answer.
To avoid using a calculator.
स्पष्टीकरण
Estimation is useful when you want a quick answer, to check your answer, or avoid using a calculator.