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If the second digit - the units or ones digit - is 0 you leave it as it is.

If it is 1, 2, 3, 4 you replace it by 0.

If it is 6, 7, 8, 9 you replace it by 0 AND add 1 to the previous digit.

If it is 5 then you replace it by 0. If the previous digit is even you leave it as it is, if it is odd, you add one.

Many schools naively teach that you should always round up 5s. This introduces an upward bias and the above is based on the IEEE standard 754. For more, on rounding half to even, see the link.

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Q: How do you round two digit numbers?
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