2nd grade Subtraction of three digit numbers Math Quiz - in this quiz students will be presented with numbers that contain three places. These are usually numbers that go up to the thousands place. In some cases students will be required to add and carry numbers to other places. In other cases they will have to add directly without carrying. This online test is free and educators can use it to supplement their regular courses like an extra homework practice. Students can take teh test unlimited number of times.