Page 12 - Math Genius C4

E:\Working\Orange_Education\Math_Genius_4\Open_Files\Chap-01
\\September 30, 2025 9:37 AM Bharat Arora P-9 Reader _________________________ Date: ___________________74

example 1: Write the following numbers in numerals using a place value chart and
separate the periods using commas.

(a) Sixty-one thousand seven hundred twenty-three
(b) Eleven thousand two hundred eighty-two
(c) Seventy-nine thousand one hundred

(d) Ninety thousand ten

Solution:
(a) tth th H T O (b) tth th H T O

6 1 7 2 3 1 1 2 8 2
Sixty-one thousand seven hundred Eleven thousand two hundred

twenty-three: 61,723 eighty-two: 11,282
(c) tth th H T O (d) tth th H T O

7 9 1 0 0 9 0 0 1 0
Seventy-nine thousand one hundred: Ninety thousand ten: 90,010

79,100
example 2: Mark the periods using commas and write the number names.
(a) 42536 (b) 50603 (c) 39827

Solution: First, write the numbers in the place value chart, then use comma (,) to

mark the periods and hence write the number names.
thousands Ones Numbers written Number names
tth th H T O using comma

(a) 4 2 5 3 6 42,536 Forty-two thousand five
hundred thirty-six
(b) 5 0 6 0 3 50,603 Fifty thousand six hundred
three
(c) 3 9 8 2 7 39,827 Thirty-nine thousand eight
hundred twenty-seven

representing 5-digit numbers on an Abacus

Let us represent the following 5-digit numbers on an abacus.

(a) 32,715 (b) 73,046

For this, we take a 5-spiked abacus and put the beads as shown.
(a) (b)
Math Insight
We do not put any bead on
the spike of the abacus, if
the corresponding place in the
tth th H T O tth th H T O number has a zero.

10 Mathematics-4