# The Model Mental Arithmetic: Containing Oral Exercises for Graded and Grammar Schools

Eldredge & Brother, 1878

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### Περιεχόμενα

 Integers 7 Properties of Numbers 59 Fractions 67 REDUCTION 75 ADDITION 84 MULTIPLICATION 91 Division 99
 RELATION OF NUMBERS 107 DECIMALS 115 SECT PAGE 131 Percentage 151 APPLICATIONS 158 MISCELLANEOUS PROBLEMS 176

### Δημοφιλή αποσπάσματα

Σελίδα 138 - TIME 60 seconds (sec.) = 1 minute (min.) 60 minutes = 1 hour (hr.) 24 hours = 1 day (da.) 7 days = 1 week (wk.) 365 days = 1 common year (yr.) 366 days = 1 leap year About 30 days = 1 month (mo.) 12 months = 1 year VALUE 10 cents (ct.
Σελίδα 133 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30| square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq. mi.) Cubic Measure 1728 cubic inches (cu.
Σελίδα 137 - TABLE. 10 Mills (m.) = 1 Cent . . ct. 10 Cents = 1 Dime . . d. 10 Dimes = 1 Dollar . \$. 10 Dollars = 1 Eagle . E.
Σελίδα 135 - DRY MEASURE 2 pints (pt.) = 1 quart (qt.) 8 quarts =1 peck (pk.) 4 pecks = 1 bushel (bu...
Σελίδα 79 - Multiplying or dividing both terms of a fraction by the same number does not change the value of the fraction.
Σελίδα 73 - If both the numerator and the denominator of a fraction are multiplied by the same number, or divided by the same number, the value of the fraction is not changed.
Σελίδα 35 - Since 0 has no value, the product of 0 and any number is 0. 1 times 1 is 1 2 times 1 are 2 3 times 1 are 3 1...
Σελίδα 178 - A can do a piece of work in 3 days, B in 4 days, and C in 6 days : in what time will they do it, working together ? 65.
Σελίδα 83 - To reduce two or more fractions to a common denominator. A Common Denominator is a denominator common to two or more fractions 1. Reduce ? and 7, to a common denominator.
Σελίδα 66 - A multiple of a number contains all the prime factors of that number ; and the common multiple of two or more numbers contains all the prime factors of each of the numbers.