Cass tried to evaluate $9\times76$ step by step.
$$ | $\phantom{=}\greenD9\times\blueD{76}$
- | -
${\text{Step } 1}$ | $=\greenD9 \times (\blueD{7} + \blueD{6})$
${\text{Step } 2}$ | $=(\greenD9 \times \blueD{7}) + (\greenD9 \times \blueD{6}) $
${\text{Step } 3}$ |$=63 + 54$
${\text{Step } 4}$ | $=117$
**Find Cass's mistake.**
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