Speed Mathematics Simplified
Entertaining, easy-to-follow suggestions for developing greater speed and accuracy in doing mathematical calculations. Surefire methods for multiplying without carrying, dividing with half the pencil work of long division, plus advice on how to add and subtract rapidly; how to check for accuracy, master fractions, work quickly with decimals, handle percentages and much more. A valuable how-to book for anyone working with numbers on a variety of levels.
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11’s remainder abacus adding addition aliquot arithmetic automatic base basic becomes borrowing breakdown cancel casting out nines chapter check ﬁgure column comple convert Cornelius Lanczos Cover the answer decimal point digit combinations digit sum discount double easier ends example factor ﬁeld ﬁnal answer ﬁnd ﬁnding ﬁnger ﬁnished ﬁrmly ﬁrst answer digit ﬁrst digit ﬁve frac glance handle improper fraction larger digit larger number last digit left to right long division look method mind minus mixed numbers multi no-carry multiplication number divided number multiplied number sense number system pairs percentage practice Problem Check proportionate change quantity quantum quantum mechanics record tens reduce Remember result rule short cuts shorthand division simpler simply single digit slash slide rule soroban speciﬁc speed mathematics technique theory three digits tion two-digit underline whole number X 7 ends zero