How to strip off numbers after the first decimal place?

Hi

Here are the decimal:
1600.15
200.46
12.89

How can I strip off the 2nd decimal place to make those decimal to be:
1600.1
200.4
12.8

I have the following code to return bool if it is more than one decimal place.

But, how can I strip off and return the one decimal place number in VC#?

public bool CheckDecimal(string number)
        {
            bool isValid = true;
            if (number.Substring(number.Length - 1, 1) != ".")
            {
                isValid = false;
            }
}

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