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# What is the odd one out 40 50 60 70 80 90 and why?

Updated: 10/22/2022

Wiki User

11y ago

50

For the spelling reason that (like 20 and 30) its name contains different letters from the numbers that represent its multiple of 10, i.e. fif instead of five.

40 - fo(u)rty

60 - sixty

70 - seventy

80 - eighty

90 - ninety

---

70

It is the only one of the numbers that contains only three different prime factors occurring once (2 x 5 x 7).

Wiki User

11y ago

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Q: What is the odd one out 40 50 60 70 80 90 and why?
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