/**
 * Apply multiples of a number if there is any.
 * @param array Array of numbers to apply the condition on.
 * @param multiples The multiples of which number.
 * @returns Array of multiples of the desired number
 */
export declare const _applyMultiples: (array: number[], multiples?: number) => number[];
/**
 * - Converts a number less than 1000 to words.
 * @param num - The number to convert (less than 1000).
 * @param isLast - Whether this is the last group (thousands, millions, etc.).
 * @returns Numbers less than 1000 in words.
 */
export declare function _convertLessThanThousand(num: number, isLast: boolean): string;
/**
 * * Calculate the HCF (Highest Common Factor) of two numbers using the Euclidean algorithm.
 *
 * @param a - First number.
 * @param b - Second number.
 * @returns The HCF of the two numbers.
 */
export declare const _find2NumbersHCF: (a: number, b: number) => number;
/**
 * * Calculate the LCM (Least Common Multiple) of two numbers using the Euclidean algorithm.
 *
 * @param a - First number.
 * @param b - Second number.
 * @returns The LCM of the two numbers.
 */
export declare const _find2NumbersLCM: (a: number, b: number) => number;
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