Lizzy: 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?.
Me: Hmmm, let me think. I think this is the detailed solution:
The cost of the dolls is 3 × $1 = $3. Amy has $100 − $3 = $97 left. Final answer: 97.