Exercise 2.3 (Importance of commas or periods)

Exercise 2.3

1. Read the following numbers by placing the commas at appropriate periods and write their number names.

a. 15731997 b. 341964 c. 29121972 d. 347810

 a. 1,57,31,997:

One crore fifty seven lakhs thirty one thousand nine hundred and ninety seven

 b. 3,41,964:

Three lakhs forty one thousand nine hundred and sixty four

c. 2,91,21,972:

Two crores ninety one lakhs twenty one thousand nine hundred and seventy two.

d. 3,47,810:

Three lakhs forty seven thousand eight hundred and ten.

2. Write the place value of 5 in the following numbers.

a. 15731997

b. 341964

c. 29121972

d. 347810

Answer: The value of 5 in 15731997 is 5 × 1000000 = 5000000

3. Write the following in standard notation.

a. 30000 + 3000 + 300 + 30 + 3 = 33333

b. 200000 + 7000 + 7 = 207007

c. 8000000 + 70000 + 3000 +30 + 5 = 8073035

d. 4000000 + 400 + 4 = 4000404

4. Write the following numbers in expanded from.

a. 63,570 = 60000+3000+500+70

b. 36,01,478 = 3000000+600000+1000+400+70+8

c. 1,45,70,004 = 10000000+4000000+500000+70000+4

d. 28,48,387 = 2000000+800000+40000+8000+300+ 80 + 7