Page 11 - Start Up Mathematics_4

To write the number name of large numbers, we divide them into groups. Each group
is called a period. Follow the given steps to group numbers. Let’s consider the number
8137546.

1. Start from extreme right and make a group of three digits. 8137546

This is the first group. It consists of ones, tens and hundreds and is called the Ones
Period.
2. The second group consists of the next two digits, i.e., thousands and ten thousands.
It is called the Thousands Period. 8137 546

3. The third group consists of the next two digits, i.e., lakhs and ten lakhs. It is called the
Lakhs Period. 81 37 546

Thus, 8137546 is written as eighty-one lakh thirty-seven thousand five hundred
forty-six.

Periods → LAKHS (L) THOUSANDS (Th) ONES (O)

Ten Lakhs Ten Thousands Hundreds Tens Ones
Lakhs Thousands
Number (TL) (L) (TTh) (Th) (H) (T) (O)

81,37,546 8 1 3 7 5 4 6

Example 1: Group the given numbers by separating them using commas. Also, write the
number names.

(a) 82675 (b) 398104 (c) 540327 (d) 1725945

Solution: (a) 82,675 → It is read as eighty-two
thousand six hundred
seventy-five.
(b) 3,98,104 → It is read as three lakh Quick Tip
ninety-eight thousand one • The digits in the same period
hundred four. are read together.

(c) 5,40,327 → It is read as five lakh forty • In a number, two
thousand three hundred periods are separated
twenty-seven. by a comma.
(d) 17,25,945 → It is read as seventeen lakh
twenty-five thousand nine
hundred forty-five.

Face Value and Place Value
We know that the face value of a digit is the value of the digit itself, while the place value
of a digit depends on its face value and its place or position in a number.

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