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why JS function returns a string instead of a number

Herandez

I wrote a function that rounded my number's decimal part into the nearest quarter(.00 | .25 | .50 | .75). but the function for some reason sent me back string type instead of number type. why is that?

const roundToQuarter = (num) => {
    let toFixed = num.slice(-2); // Num is a number with 2 decimal digits
    toFixed %= 25;
    if (toFixed <= 12) {
        return num - toFixed / 100;
    }
    return num + (25 - toFixed) / 100;
};