You can activate the skill by saying "Alexa, open math helper". Once Alexa welcomes you to the skill, you can say "what is x plus y" or "what is x minus y" or "multiply x and y" or "divide x by y". Replace x and y in each command with actual numbers. x and y should be non-negative whole numbers, i.e. fractions, decimals and negative numbers are not supported. However the result of the arithmetic could be a decimal number or a negative number.
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