Page 14 - ICSE Math 5

Indian Number International Indian Number International
System Number System System Number System

1 lakh = 100 thousands 1 crore = 10 million

10 lakhs = 1 million 10 crores = 100 million

Example 2: Write 795432651 in both the Indian and
Remember
International number systems. Also, write its
The first three places
number name in both the systems.
from the extreme right
Solution: Indian Number System: 79,54,32,651 are the same in both the
Indian and International
It is read as seventy-nine crore fifty-four lakh number systems.
thirty-two thousand six hundred fifty-one.

International Number System: 795,432,651
It is read as seven hundred ninety-five million four hundred thirty-two thousand six
hundred fifty-one.

Exercise 1.1

1. Separate the given numbers into periods as per the Indian number system by putting
commas. Also, write their number names.

(a) 40530217 (b) 132305604 (c) 81754008 (d) 8532562

2. Using commas, separate the given numbers into periods according to the International
number system and write their number names.
(a) 2531786 (b) 13275196 (c) 8203005 (d) 105327550

3. Write the given number names in figures.

(a) Thirty-one crore two lakh twenty-one thousand five hundred six
(b) Four crore five lakh seventy-one thousand two hundred five
(c) Forty crore twenty-seven lakh two thousand six hundred eighty-three

(d) Eighty-two lakh forty thousand five hundred four
(e) Twenty-six crore forty-one lakh six thousand four hundred two

4. Write the given number names in figures.
(a) Four million two hundred twenty-three thousand six hundred forty-six

(b) Thirty-six million four thousand one hundred ninety-two
(c) Seven hundred fifty-three million forty-two thousand eight hundred ninety-three

(d) Five million four hundred sixty-three thousand two hundred fifty-one
(e) Seventy-five million three hundred five

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