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What was the purpose of the Eratosthenes sieve?

to check whether a given number is divisible by 7
to round numbers to 10 decimal places
for determining consecutive digits in the number π.
for finding all prime numbers up to any given limit
In mathematics, the sieve of Eratosthenes is a simple, ancient algorithm for finding all prime numbers up to any given limit. It does so by iteratively marking as composite (i.e., not prime) the multiples of each prime, starting with the first prime number, 2.
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to check whether a given number is divisible by 7
to round numbers to 10 decimal places
for determining consecutive digits in the number π.
for finding all prime numbers up to any given limit
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What is the sum of the opposite sides of a dice?

5
6
7
8

Augustus was born on 1 January 10BC. Which birthday did he celebrate at 1 January 10AD?

19
20
21
80

How many edges does a Möbius strip have?

one
two
three
four

Where does water boil at the temperature 37 °C (98.6 °F)?

in a microwave oven
at the Armstrong's line
at the Kármán line
on Mount Everest