Question

Estimate 548 + 251 to the nearest hundreds.

• A. 800
• B. 700
• C. 1,000
• D. 900

Answer 1

The correct option is A 800

Say:
$\bullet$ Estimation is approximating the given value to make the calculation easier.

$\bullet$ Round off the given numbers to the nearest hundreds.

Steps:
$\bullet$ What is the estimated value of 548?
Ans: 500 (WB1)

$\bullet$ What is the estimated value of 251?
Ans: 300 (WB1)

$\bullet$ What is the estimated value of 548 + 251?
Ans: 500 + 300 = 800 (WB2)

WB1:


WB2:


Q: When should we not use estimation?
A: We should not use estimation where accuracy is needed.

Example: If a patient needs 12 ml of medicine, we should not round it off to 10 ml and use it. It may disturb the treatment.
So, we should be aware of when to estimate and when not to.