Example consumer contract for PRBMathUD60x18 library: https://github.com/paulrberg/prb-math

PRBMathUD60x18Consumer.sol

// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.8.0;

import "@prb/math/contracts/PRBMathUD60x18.sol";

contract UnsignedConsumer {
  using PRBMathUD60x18 for uint256;

  /// @notice Calculates x*1e18÷y while handling possible intermediary overflow.
  function unsignedDiv(uint256 x, uint256 y) external pure returns (uint256 result) {
    result = x.div(y);
  }

  /// @notice Calculates x*y÷1e18 while handling possible intermediary overflow.
  /// @dev Try this with x = type(uint256).max and y = 5e17.
  function unsignedMul(uint256 x, uint256 y) external pure returns (uint256 result) {
    result = x.mul(y);
  }
}