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Step 5Running total
In a similar manner to the previous technique, a string of small additions may be best handled by simply keeping a running total as the numbers are added in order. 2+2+3+4+5 = 4+3+4+54 = 7+4+5 = 11+5 = 16. A more experienced mental mathematician could probably reduce the number of steps with larger recognitions- if you recognise from sight that 2+2+3=7, compress that into one step and skip to 7+4+5.
Pros: conceptually simple, very general
Cons: not a great speed improvement
Pros: conceptually simple, very general
Cons: not a great speed improvement
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