Answer:
a) 40050017 = 40,050,017
Forty million fifty thousand and seventeen
b) 251400 = 251,400
Two hundred fifty one thousand and four hundred
Explanation:
In international system commas are placed after three digits starting from the unit's place.
a) 40050017 = 40,050,017
Forty million fifty thousand and seventeen
b) 251400 = 251,400
Two hundred fifty one thousand and four hundred
It can be placed as shown below.
TM, M, HTh , TTh, Th, H, T, O
4 0 0 5 0 0 1 7
2 5 1 4 0 0