FACTORS ARE NUMBERS THAT DIVIDE EXACTLY INTO ANOTHER NUMBER.
FOR EXAMPLE, THE FACTORS OF 6 ARE: 1, 2, 3, 6
FACTORS CAN BE SHOWN IN PAIRS. EACH PAIR MULTIPLES TO MAKE E.
THE FACTOR PAIRS OF 6 CAN BE SHOWN:
1 X 6 = 6
2 X 3 = 6
CHOOSE A DIFFICULTY LEVEL AND TRY SOME OF THESE