Place commas according to the periods and then write the number names.
(e) 1761829
1761829 is written as 17,61,829
1761829 can be written as Seventeen lakh sixty-one thousand eight hundred twenty nine.
(b) 842907
Write the number according to Indian Place Value Chart. Insert commas to separate the periods:392689
Write the number according to Indian Place Value Chart. Insert commas to separate the periods: 56903275