Children can learn their timetables with this mechanical calculator. Simply turn the knobs on the sides to select numbers between one and ten, and see multiplication and division equations at the same time. For example, “3 x 6 = 18 / 6 = 3.” “The tables tube is a fun, but inexpensive way of bringing the times tables wherever they go,” International Playthings Inc. Representative Nicole Tiedemann told TDmonthly. “Kids can surely use the practice, and will also love having a cool way of studying right in their pocket.”