The New Methods in Arithmetic

Rand, McNally, 1921 - 260 σελίδες

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Σελίδα 228 - To reduce a mixed number to an improper fraction, Multiply the whole number by the denominator of the fraction, and to the product add the numerator; under this sum write the denominator.
Σελίδα 31 - That is, we have multiplied the denominator of the dividend by the number denoting the numerator of the divisor, and the numerator of the dividend by the...
Σελίδα 171 - The square of the sum of two numbers is equal to the square of the first number plus twice the product of the first and second number plus the square of the second number.
Σελίδα 228 - Multiplying or dividing both terms of a fraction by the same number does not change the value of the fraction.
Σελίδα 205 - Make a mark in the dividend as many places to the right of the decimal point as there are decimal places in the divisor. Place the decimal point in the quotient directly above this mark.
Σελίδα 130 - Grade 6, there will be some pupils who can (except for occasional slips) solve thft entire hundred, and some who cannot solve more than fifty — not if they struggle for hundreds of hours. Problems of a certain degree of complexity and abstractedness they simply cannot solve, just as they cannot jump over a fence five feet high or lift a weight of five hundred pounds.
Σελίδα 227 - Therefore, To reduce fractions to similar fractions with a given common denominator : We divide the given common denominator by the denominator of the first fraction, and multiply the quotient by its numerator, and this will be the required numerator of the first fraction. In the same way we find the numerator of each of the other fractions. Reduce to similar fractions having for denominator the number given in parenthesis for each problem : 1.
Σελίδα 28 - Divide the denominator by the whole number, when it can be done without a remainder ; otherwise, multiply the numerator by it, and under the product write the denominator, which may then be reduced to a whole or mixed number.
Σελίδα 23 - ... first three : what is their sum? Ans. 3448. 31. The Pyramids of Egypt were built 337 years before the founding of Carthage ; Carthage was founded 49 years before the destruction of Troy ; Troy was destroyed 431 years before Rome was founded ; Carthage was destroyed 607 years after the founding of Rome, and 146 before the Christian era. How many years before Christ were the Pyramids built?