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For example, the number 50,801,592 is read in the International System as fifty million eight
hundred one thousand five hundred ninety two.
Comparison between Indian and International numeration system

Video link:
https://www.youtube.com/watch?v=OSDKH5NFR3s
https://www.youtube.com/watch?v=lYnIGu_dPkE

Check your understanding: (NCERT – Pg-11, Try These)
Read and Write these numbers using placement boxes and then using commas in Indian as
well as International System of Numeration.
(iii) 18950049 (iv) 70002509
Examples: (NCERT – EX-1.1)
1. Fill in the blanks:
(a) 1 lakh = 10 ten thousand.
૚,૙૙,૙૙૙
Sol: = 10
૚૙,૙૙૙
(b) 1 million = _______ hundred thousand.
૚,૙૙૙,૙૙૙
Sol: = 10
૚૙૙,૙૙૙

Large numbers in practice

1) Ex- How many centimetres make a kilometre?
Solution: 1 km = 1000 m = (1000 x 100) cm = 1,00,000 cm (AS 1 m = 100 cm)
So, 1,00,000 centimetres make a kilometre.

2) A box contains 2,00,000 medicine tablets each weighing 20 mg. What is the total
weight of all the tablets in the box in grams and in kilograms?
Solution: weight of each tablet = 20 mg
weight of 2,00,000 tablets = 2,00,000 x 20 mg = 40,00,000 mg
ଵ
1 mg = g
ଵ଴଴଴
ଵ
So, 40,00,000 mg = (40,00,000 x )g = 4000 g
ଵ଴଴଴

ଵ
1 g = kg
ଵ଴଴଴
ଵ
So, 4000 g = (4000 x ) kg = 4 kg
ଵ଴଴଴