To write 40 in words, we must know the place of each value. Place value is the position of each value/number which starts from ones, tens, hundreds, and thousands.
Let's find the place value of, 40 with a simple chart:
|
Hundreds |
Tens |
Ones |
|
0 |
4 |
0 |
In Ten's place there are 4 and in one's place it is 0. Combining them together we get, 40 which is written as forty.
Now we know how to write 40 in words, so, let's learn more about the number 40 but exploring some mathematical properties.
|
Mathematical Property |
Answers |
|
Is 40 a prime number? |
No |
|
Is 40 a composite number? |
Yes |
|
Is 40 a perfect square? |
No |
|
Is 40 a perfect cube? |
No |
|
Square root of 40 |
6.32 |
|
Cube root of 40 |
3.42 |
|
Is 40 an even number? |
Yes |
|
Is 40 an odd number? |
No |
|
Factors of 40 |
1, 2, 4, 5, 8, 10, 20, 40 |
|
Prime factors of 40 |
2 × 2 × 2 × 5 (or 23 × 5) |
|
Multiples of 40 |
40, 80, 120, 160, ... |


While learning about 40 in words, students may likely make mistakes, to avoid them a few mistakes with solutions are given below:
confusion between similar writing styles of words.
Students sometimes get confused between the sounds and writing style of words and think that it is the same word. For example: they think Eighty five as Eighty five hundreds. To avoid this, they should remember the place value chart.
Not remembering the place value.
Students sometimes get confused between the place values, they may skip the terms and write only five instead of eighty-five. They should always spit the number to find the place values.
complicating the word form
Students tend to mix twelve with large numbers greater numbers like 850 or 8500 without understanding the values of zero to make them greater, and write them as Eighty five hundreds.
In words, 40 is written as forty.
Forty-Five in numbers is written as 45
In numbers thirteen thousand is written as, 13000.
Ninety million Ninety Thousand in numbers is written as 90,090,090.

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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