declare function sum(a: number | null, b: number | null): number;
declare function minus(a: number | null, b: number | null): number;
declare function multiple(a: number | null, b: number | null): number;
declare function roundTo(num: number | null, precision?: number | null): number;
declare function divide(a: number | null, b: number | null): number;
declare const sumN: (...numbers: (number | null)[]) => any;
declare const minusN: (...numbers: (number | null)[]) => any;
export { sum, minus, multiple, divide, sumN, minusN, roundTo };