There are multiple ways of aproaching this. I have even more answers.
*0-all number have a negative which always = zero.
*1-he tells you to add all the numbers, he says numbers only once.
*2-he says number twice, includiding the plural form numbers.
*3-all numbers together is 3 words.
*24... 33 all the times number/numbers has been mentioned in this topic up to this post including when I say the word "number".