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Drill chart in addition where sums do not exceed 10:

The teacher may point to any one of the combinations, requiring the pupil to answer promptly. Or the pupil may be asked to give the sums in a certain column from left to right, or from top to bottom.

Our system of numbers is a decimal system, and therefore in teaching the addition of numbers whose sum exceeds 10, as 7+5, we think that 3 added to 7 makes 10; hence

$$7+5=7+3+2=12\ $$

$$8+7=8+2+5=15\ $$

$$6+8=6+4+4=14\ $$

Much practice in this work will give a pupil great power in dealing with all numbers, and it will emphasize our decimal system.