As a user, I want to be able to add two numbers so that I don’t have to do the work manually
UAT
- [] 8
<enter>5<plus>-> [13] - [] 8
<enter><plus>-> [8] - [] 8
<plus>-> [8] - [] -3
<enter>7<plus>-> [4] - [4, 5, 3]
<plus>-> [4, 8]-> [12] -> [12]

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