Amy's grandfather gave her $100 for her birthday. Amy bought 3 dolls, each of which cost $1. How much money does Amy have left?
The cost of the dolls is 3 * $1 = $
<gadget id="calculator">3*1</gadget>
<output>3</output>
3.
Amy has $100 - $3 = $97 left.

<result>97</result>