Elementary arithmetic and how to teach it

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Wm. Isbister, Limited, 1879 - 349 σελίδες
 

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Σελίδα 191 - To multiply a fraction by a fraction. Multiply the numerators together for a new numerator, and the denominators together for a new denominator.
Σελίδα 151 - T for the third, and £ for the last, and the rule would then be 55. We again insist that the young reader will read this chapter carefully over. PROPORTION. 56. When four numbers following each other are such that the first is as many times greater or less than the second, as the third is greater or less than the fourth, they are said to be in proportion ; thus, 2, 4, 3, 6, usually written thus...
Σελίδα 225 - When a decimal number is to be divided by 10, 100, 1000, &c., remove the decimal point as many places to the left as there are ciphers in the divisor, and if there be not figures enough in the number, prefix ciphers.
Σελίδα 222 - To multiply a decimal by 10, 100, 1000, &c., remove the decimal point as many places to the right as there are ciphers in the multiplier ; and if there be not places enough in the number, annex ciphers.
Σελίδα 144 - Operations with Fractions A) To change a mixed number to an improper fraction, simply multiply the whole number by the denominator of the fraction and add the numerator.
Σελίδα 210 - A and B can do a piece of work in 12 days, B and C together do it in 15 days.
Σελίδα 145 - Multiplying or dividing both the numerator and denominator of a fraction by the same number does not change the value of the fraction.
Σελίδα 210 - A can do a piece of work in 5 days, B in 6 days, and C in 7£ days ; in what time will they do it, all working together?
Σελίδα 209 - WRITTEN. 1. A can do a piece of work in 6 days, and B can do it in 8 days.
Σελίδα 246 - If 25 men do a piece of work in 24 days, working 8 hours a day, in how many days would 30 men do the same piece of work working 10 hours a day ? 5.

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