Instead, focus on addition by subtraction.
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The question is, will they do it by addition or subtraction?
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Subtraction by Addition: When things get hard, the inclination is to do more.
It also expects pupils be able to recall subtraction and addition sums to 20 by the age of seven.
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They do so by starting chain-reactions that result in the addition and subtraction of molecular sub-units known as phosphate groups from particular proteins in the nerve cell being stimulated.
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