Find four irrational number between 80 and 85
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Answer:
You evaluate the 5 odd numbers from 81 to 89.
Explanation:
In division testing you may skip
2
now, we can also skip
5
if the number doesn't end in
5
or
0
81
/
3
=
27
comes out evenly
83
/
3
=
27
and 2 left
83
/
7
=
11
and 6 left
We don't have to test any further: 83 is prime
85
/
5
=
19
comes out evenly
87
/
3
=
29
comes out evenly
89
/
3
=
29
and 2 left
89
/
7
=
12
and 5 left
We don't have to test any further: 89 is prime
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