81 in words is written as Eighty-one. In both the International System of Numerals and the Indian System of Numerals, 81 is written as Eighty-one. The number 81 is a Cardinal Number as it represents some quantity. For example, “there are 81 apples in that basket”, 81 illustrates the number of apples.
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81 in Words |
Eighty-one |
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Eighty-one in Number |
81 |
81 in English Words
We write 81 in English Words using the letters of English alphabets. Therefore, we spell 81 in English as “Eighty-one.”
How to Write 81 in Words?
To write 81 in words, we shall use the place value chart. In the place value chart, write 1 in the ones place and 8 in the tens place. Let us make a place value chart to write the number 81 in words.
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Tens |
Ones |
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8 |
1 |
Thus, we can write the expanded form as
8 × Ten + 1 × One
= 8 × 10 + 1 × 1
= 80 + 1
= 81
= Eighty-one.
About the Number 81
81 is the natural number which is the successor of 80 and predecessor of 82.
81 in words – Eighty-one
- Is 81 an odd number? – Yes
- Is 81 an even number? – No
- Is 81 a perfect square number? – Yes; 9 × 9 = 81
- Is 81 a perfect cube number? – No
- Is 81 a prime number? – No
- Is 81 a composite number? – Yes
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