Accuracy should be first considered, thenrapidity. Quick adders, by the way, are themost accurate. Write the numbers in verticallines, avoiding irregularity. This is important.Keep your thought on results not numbersthemselves. Do not reckon 7 and 4 are 11 and8 are 19, but say 7, 11, 19 and so on.

When the same number is repeated severaltimes, multiply instead of adding.

When adding horizontally begin at the left.