Exercise 2.3 - Chapter 2 Numbers Term 1 5th Maths Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated On May 15, 2024

By SaraNextGen

Ex $2.3$
Question 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
Answer:
a. 15731997
$15731997=1,57,31,997$
Number Name: One crore fifty seven lakhs thirty one thousands nine hundred and ninety seven.
b. 341964
$341964=3,41,964$
Number Name: Three lakhs forty one thousands nine hundred and sixty four.
c. 21921972
$21921972=2,19,21,972$
Number Name; Two crores nineteen lakhs twenty one thousands nine hundred and seventy two.
d. 347810
$347810=3,47,810$
Number Name: Three lakhs forty seven thousands eight hundred and ten.

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

a. 287500
b. 586012
c. 5869732
d. 5467859
Answer:
a. 287500
The place value of 5 is $5 \times 100=500$
b. 586012
The place value of 5 is $5 \times 1,00,000=5,00,000$
c. 5869732
The place value of 5 is $5 \times 10,00,000=50,00,000$
d. 5467859
The place value of first 5 is $5 \times 10=50$
The place value of Second 5 is $5 \times 10,00,000=5000,000$
 

Question $3 .$
Write the following in standard notation.
a. $30000+3000+300+30+3$
b. $200000+7000+7$
c. $8000000+70000+3000+30+5$
d. $4000000+400+4$
Answer:
a. $30000+3000+300+30+3$
$=33333=33,333$
b. $200000+7000+7$
$=207007=2,07,007$
c. $8000000+70000+3000+30+5$
$=8073035=80,73,035$

$\begin{aligned}
&\text { d. } 4000000+400+4 \\
&=4000404=40,00,404
\end{aligned}$
 

Question $4 .$
Write the following numbers in expanded form.
a. 63,570
b. $36,01,478$
c. $1,45,70,004$
d. $28,48,387$
Answer:
a. 63,570
$=60000+3000+500+70+0$
b. $36,01,478$
$=3000000+600000+1000+400+70+8$
c. $1,45,70,004$
$=10000000+4000000+500000+70000+4$
d. $28,48,387$
$=2000000+800000+40000+8000+300+80+7$