20 spelling is **twenty**.

21 can be written in words as “Twenty-one”.

1 - One, 2 - Two, 3 - Three, 4 - Four, 5 - Five, 6 - Six, 7 - Seven, 8 - Eight, 9 - Nine, 10 - Ten, 11 - Eleven, 12 - Twelve, 13 - Thirteen, 14 - Fourteen, 15 - Fifteen, 16 - Sixteen, 17 - Seventeen, 18 - Eighteen, 19 - Nineteen, 20 - Twenty, 21 - twenty-one, 22 - twenty-two, 23 - twenty-three, 24 - twenty-four, 25 - ...

Thus, 25 in words is written as Twenty-Five.

Forty is the correct spelling of the cardinal number used to indicate a quantity of something. “Fourty” is sometimes used instead of forty, but this is incorrect.

Thus, 50 in words is written as Fifty.

Natural Numbers The numbers that we use when we are counting or ordering {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 …}

100 in words is written as One hundred or simply Hundred. The name of the number 100 in English is “Hundred”.

Therefore, the number 50000 in words is Fifty Thousand. Also, read: Numbers in Words.

30000 in words is written as Thirty-thousand.

1 - One, 2 - Two, 3 - Three, 4 - Four, 5 - Five, 6 - Six, 7 - Seven, 8 - Eight, 9 - Nine, 10 - Ten, 11 - Eleven, 12 - Twelve, 13 - Thirteen, 14 - Fourteen, 15 - Fifteen, 16 - Sixteen, 17 - Seventeen, 18 - Eighteen, 19 - Nineteen, 20 - Twenty, and so on.

9999 in words is written as “Nine Thousand Nine Hundred Ninety-Nine”.

A 7-8 year old is spelling words they read and use frequently. By this age children are spelling many high frequency words (words we see written commonly) correctly. They are also spelling correctly a list of personal word including names of their suburb, family members, friends and pet's names.

5-6 year olds will learn to spell simple, common CVC (consonant-vowel-consonant) words. Once children are listening carefully and have a good understanding of sound-letter correspondence they will begin attempting simple CVC (consonant-vowel-consonant) when writing.

Hence, 100000 in words is one hundred thousand.

10000 in words can be written as Ten thousand.

1100 in words is written as One thousand one hundred. In both the International System of Numerals and the Indian System of Numerals, 1100 is written as One thousand one hundred.

Natural numbers are a part of the number system which includes all the positive integers from 1 till infinity and are also used for counting purpose. It does not include zero (0).

Integers (Z). This is the set of all whole numbers plus all the negatives (or opposites) of the natural numbers, i.e., {… , ⁻2, ⁻1, 0, 1, 2, …}

Therefore, 1000 in words is written as One thousand. Learn more about place value here.

Therefore, 12000 is written as twelve thousand in words.

According to arithmetic progression, natural numbers can be written down as 1, 2, 3, 4, 5, 6, 7, and 8 to 100. Basically, the sum of the first 100 natural numbers is equal to 5050.