Question

Roby had 2,045 cents. If he buys 50 chocolates worth 20 cents each, estimate the remaining amount with him. (Round off to the nearest hundreds)

• A. 3,000 cents
• B. 1,500 cents
• C. 1,000 cents
• D. 2,000 cents

Answer 1

The correct option is C 1,000 cents

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

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

Steps:
$\bullet$ How much did Roby have?
Ans: 2,045 cents

$\bullet$ What is the estimated value of 2,045?
Ans: 2,000 (WB1)

$\bullet$ How many chocolates did Roby buy?
Ans: 50

$\bullet$ What is the cost of each chocolate?
Ans: 20 cents

$\bullet$ Which operation do we use to find the total cost of 50 chocolates?
Ans: Multiplication

$\bullet$ What is the cost of 50 chocolates?
Ans: 50 × 20 = 1,000 cents (WB2)

$\bullet$ Which operation do we use to find the remaining amount with Roby?
Ans: Subtraction

$\bullet$ How much money will remain with Roby?
Ans: 2,000 - 1,000 = 1,000 cents (WB2)

WB1:


WB2: