[nerv_]

/**
 * Example: (57, 10) => 60
 * @param {Number} number
 * @param {Number} precision
 * @returns {Number}
 */
function roundUp(number, precision) {
    return Math.ceil(number / precision) * precision;
}
/**
 * Example: (57, 10) => 50
 * @param {Number} number
 * @param {Number} precision
 * @returns {Number}
 */
function roundDown(number, precision) {
    return Math.floor(number / precision) * precision;
}


alert(roundUp(301, 5));
alert(roundDown(301, 5));