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For prime factoring, click the number button to enter a number between 0 and 100 in the textbox. Then, press the arrow keys to find a prime factor of the number in the textbox. The prime numbers are seen right below the textbox. Only prime number will be displayed. To select a prime factor click on the numbers across the vertical line directly to the right of the prime numbers. Click on these numbers in order from left to right to select prime factors. After you select a prime factor a new product will appear above the factor. For each product that appears, press the arrow keys to find another prime factor. Then, click the next number across the vertical line until the product '1' appears above the selected prime factor. By pressing the right arrow key, you can jump multiples of ten  numbers at a time.