Fizz and fizz-bang.
With Fizz the group count out loud, one number per person, and you replace every number that either contains, or is a multiple of 5 with Fizz. So 1,2,3,4, Fizz, 6,7,8,9, Fizz - harder than you think, and if a person gets it wrong, it hesitates too long, they are out.
Fizz Buzz is similar but every number containing, or a multiple of 5 is Fizz, and ever number containing or a multiple of 7 is Buzz. Where a number is both - 35 for example, or 57 - the person whose turn it is has to call FizzBuzz. If it’s 75, if you get that far, it’s obviously BuzzFizz. Same rules on being knocked out.