Question

Alex wants to buy 34 pens and 38 pencils. The cost of each pen is ₹18 and the cost of each pencil is ₹ 13.

Find an estimate for how much this will cost Alex in ₹.

Answer 1

In order to find the estimated cost to Alex, we can round off the prices to the nearest tens.

The cost per pen is ₹18 so the estimated cost per pen is ₹20 when rounded off to the nearest ten( ones place digit is 8, which is greater than 5)

Similarly, cost per pencil is ₹ 13 so estimated cost for per pencil is 10 when rounded off to the nearest ten( ones place digit is 3, which is less than 5)

Therefore, the total estimated cost is
34 × ₹ 20 + 38 × ₹ 10
₹ 680 + ₹ 380
= ₹ 1060, which is the required answer.