NCERT Class 6 Solutions: Knowing Your Numbers (Chapter 1) Exercise 1.3 – Part 2
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Q3 Estimate the following products using general rule (round the numbers to simplest possible one significant figure) before multiplication:
Solution:

Here we will round off the numbers hundredths and keep only one nonzero digit in each number. This will make the multiplication simple. 578 and 161 will be rounded off to (nearest hundredths) 600 and 200 respectively

Here we will round off the numbers thousands and keep only one nonzero digit in each number. This will make the multiplication simple. So 5281 and 3491 may be rounded off to 5000 and 3000 respectively

Here we will round off the numbers to thousands and hundredths respectively and keep only one nonzero digit in each number. This will make the multiplication simple. 1291 and 592 may be rounded off to 1000 and 600 respectively

Here we will round off the numbers to thousands and tens respectively and keep only one nonzero digit in each number. This will make the multiplication simple. 9250 and 29 may be rounded off to 9000 and 30 respectively