to additional errors by enlarging the possible additions in a body of
numbers. We are taught the multiplication table up to twelve times
twelve. We never stumble up to that point. But it ought to continue up
to one hundred times one hundred. We could then always add two figures
to two figures easier then to parcel the operation out into two jobs.
The "lightning calculator" had probably carried it up to five thousand
times five thousand. Take an interest in "sums." Learn