export default class MathUtils {
    static isStringNumber(str: string): boolean;
    private static prepareValues;
    private static padDecimal;
    private static switchSign;
    static add(val1: string, val2: string): string;
    static sub(val1: string, val2: string): string;
    static div(val1: string, val2: string): string;
    static mul(val1: string, val2: string): string;
    static round(val: string, decimal?: number): string;
    static ceil(val: string, decimal?: number): string;
    static floor(val: string, decimal?: number): string;
    private static mul10;
    private static trim;
    private static privateAdd;
    private static privateSub;
}