zero is even. It doesnât matter if it has an E because itâs even. We know that it is even because zero divided by two is a whole number, zero
one is odd. It has an E as the third letter. onE. We know that it is odd because one divided by two is not a whole number, but one half.
two is even. It doesnât matter if it has an E because itâs even. We know that it is even because two divided by two is a whole number, one
three is odd. It has an E as the fourth and fifth letters. thrEE. We know that it is odd because three divided by two is not a whole number, but one and a half.
four is even. It doesnât matter if it has an E because itâs even. We know that it is even because four divided by two is a whole number, two
five is odd. It has an E as the fourth letter. fivE. We know that it is odd because five divided by two is not a whole number, but two and a half.
six is even. It doesnât matter if it has an E because itâs even. We know that it is even because six divided by two is a whole number, three
seven is odd. It has an E as the second and fourth letters. sEvEn. We know that it is odd because seven divided by two is not a whole number, but three and a half.
eight is even. It doesnât matter if it has an E because itâs even. We know that it is even because eight divided by two is a whole number, four
nine is odd. It has an E as the fourth letter. ninE. We know that it is odd because nine divided by two is not a whole number, but four and a half.
every multiple of ten is even. It doesnât matter if it has an E because itâs even. We know that they are even because a multiple of ten divided by two is a whole number, a multiple of five.
If you add ten to an odd number, the new number is still odd, and if you add ten to an even number, the new number is still even.
Any number with anything but zeroes to the right of the decimal point is not a whole number. When determining if a whole number is even or odd, you only need to look at the first digit to the left of the decimal point.
The spelling of every whole number contains the spelling of the first digit directly to the left of the zero, except multiples of ten and the numbers from 11 to 19. I have already covered the multiples of ten, so
ElEvEn - odd and has an E
twelve - is even and thus doesnât matter
thirtEEn - odd and has an E
fourteen - is even and thus doesnât matter
fiftEEn - odd and has an E
sixteen - is even and thus doesnât matter
sEvEntEEn - odd and has an E
eighteen - is even and thus doesnât matter
ninEtEEn - odd and has an E