第 1 單元，第 1 課

A Plan for Problem Solving解題的計畫

背單字

four-step plan解題四步驟
I used the four-step plan to find the cost of the trip.
strategy策略
Drawing a picture is a useful strategy.
multi-step problem多步驟問題
Finding a total and then sharing it equally is a multi-step problem.
estimate估算
\(31 \times 9\) is about \(30 \times 9 = 270\).

這課的重點字