Place value is what we need to consider when we write numbers in words. The number, 400 in words, can be written as four hundred.

Place value is the value of each digit in a number like ones, tens, hundreds, thousands. When writing a number in words, we need to consider place value.
|
Hundreds |
Tens |
Ones |
|
4 |
0 |
0 |
This is how we split the number, 400 according to the place value. So, here we have two in hundreds places and zero in ones and tens of places. So, 400 in words is two hundred.
All the numbers have different mathematical properties. Now we can learn some properties of number 400.
|
Mathematical Property |
Answers |
|
Is 400 a composite number? |
Yes |
|
Is 400 a prime number? |
No |
|
Is 400 a perfect cube? |
No |
|
Is 400 a perfect square? |
Yes |
|
Cube root of 400 |
7.37 |
|
Square root of 400 |
20 |
|
Is 400 an even number? |
Yes |
|
Is 400 an odd number? |
No |
|
Factors of 400 |
1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400. |
|
Prime factors of 400 |
2, 5 (24 × 52) |
|
Multiples of 400 |
400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000 |


Students while writing numbers in words tend to make some common errors. Here is a list of common errors made by students and the ways to avoid them.
Spelling mistakes
Students tend to make spelling mistakes always, so to avoid it, try to memorize it. Some common spelling mistakes for the word hundred are hundred, hundred, hundreds, etc.
Formatting errors
Mixing up numbers and words is again a common mistake. For example one apple and 2 chocolate, instead, we should write 1 apple and 2 chocolate.
Using unnecessary hyphens
Adding hyphens in between is another mistake children tend to make again. Hyphens are only used while writing compound numbers.
Incorrect use of the word and
Adding and after writing a place value is a mistake. But in American English, when we write numbers in words, we won't add and. In British English it is written as two hundred and ten, whereas in American English it is written as two hundred ten.
Incorrect use of capitalization
When writing numbers in words, there is no need to add writing in capital letters unless it is at the beginning of a sentence.
It is written as four hundred forty, as it has four in hundred and tens place and zero in one's place.
The square root of 400 is ±20. When we multiply 20 with 20 it's 400.
When we divide the 400 by 25 the answer is 16. To verify 25 × 16 it is 400.
In roman numerals, C stands for 100 and D for 500. So, CD is 400 in roman numerals.
The number 40 is written in words as forty because it has four in ten place and zero in one's place.
Even numbers: Any numbers which are evenly divisible by 2 are even numbers.
Odd number: The numbers which are not divisible by 2 are odd numbers.
Prime numbers: The numbers which have only two factors, that is one and the number itself
Square root: The square root of a number is a number which when multiplied by the number gives the number
Factors: The factor of a number is any number which can divide the number evenly.

Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.
: She loves to read number jokes and games.
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