Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 5th

# Introducing the Six Digit Number - 1,00,000:

We know that 99 is the greatest 2-digit number.
Similarly, the greatest 3-digit number is 999 and the greatest 4-digit number is 9999.
Look at the pattern:
9 + 1 = 10 = 10 × 1
99 + 1 = 100 = 10 × 10
999 + 1 = 1000 = 10 × 100

We observe that

• Greatest single digit number + 1 = smallest 2-digit number
(9 + 1 = 10)
• Greatest 2-digit number + 1 = smallest 3-digit number
(99 + 1 = 100)
• Greatest 3-digit number + 1 = smallest 4-digit number
(999 + 1 = 1,000)
• Moving forward, We should then expect that on adding 1 to the greatest 4-digit number, we would get the smallest 5-digit number, that is 9999 + 1 = 10000 and it is known as ten thousand.
• Adding 1 to the greatest 5-digit number, should give the smallest 6-digit number: 99,999 + 1 = 1,00,000. This number is named one lakh.
One lakh comes next to 99,999. 10 × 10,000 = 1,00,000.

We may now write 6-digit numbers in the expanded form as
3,53,500 = 3 × 1,00,000 + 5 × 10,000 + 3 × 1000 + 5 × 100.
This number has 0 at one's place, 0 at ten's place, 5 at hundred's place, 3 at thousands place, 5 at ten thousand's place and 3 at lakh place. Its number name is three Lakh fifty-three thousand five hundred.

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Introducing the Six Digit Number - 1,00,000 [00:19:48]
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