Question

Estimate the following product using the general rule:
578 × 161

Answer 1

Step 1: Round off the number to its greatest place value.

In 578, the digit 7 in the tens place is greater than 5. So, adding one to the digit at hundreds place, we get the result as 600.
In 161, the digit 6 at the tens place is greater than 5. So, adding one to the digit at hundreds place, we get the result as 200.

Step 2: Find the product: 600 × 200 = 1,20,000