Click on the blue button to ask a question. Then type in the first number of the question and click the white checkmark. Then type in the second number of the question and click the white checkmark again. Then it will multiply the two numbers and will say the answer for 10 seconds. If the first or second number times 1 is smaller than 1 or the first or second number is a letter then a pop up appears saying you cannot do that. The calculator can support lots of numbers. Even numbers as big as 109e356 and higher!