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#20 40 60
#7 8 15
#60+15=75
#20 40 60
#7 8 15
#60+15=75
#20 40 60
#7 8 15
#60+15=75
#20 40 60
#7 8 15
#15 60 75
#mentally rearranges problem so that it’s vertical format
#7 8 15
#carry the 1
#1 2 4 7
#20 40 60
#7 8 15
#15 60 75
#20 40 60
#7 8 15
#15 60 75
#7 8 15
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