Items related to Preston-Stevens elementary arithmetic Volume 1
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...acres of land five tenths acres were sold. What decimal part of an acre remained? Write the answer in words. MULTIPLICATION OF DECIMALS 93. Multiplication of decimals is the same as multiplication of whole numbers; the placing of the decimal point to locate units' place in the product is the only point requiring especial attention. 350 $3.50.350 350 350 3.50 x 4 x 4 x.4 x 4 x.04 x.4 1400 $14.00 1.400 140.0 14.00 1.400 If you will carefully study the pointing off of the product in each of the above examples, you will see that there are as many places pointed off in the product as there are decimal places in both multiplier and multiplicand. When we multiply tenths by tenths, the product is hundredths. When we multiply hundreds by tenths, the product is thousandths. To multiply where there are decimal places in one or both of the factors, we multiply as in whole numbers, and point off as many decimal places in the product as there are decimal places in both factors. 94. i. Multiply 875 by.05. Multiply 67.5by.03. 2. 67.05 x.8..008 x 345. 894 x 025. 3. 8.75 x 234.5. 789.6 x 67.15. 453.25 x.7. 4. Find the cost of 15.7 cords of wood at $2.40 a cord. DIVISION OF DECIMALS 95. Division of decimals is like division of whole numbers, except that the matter of locating units' place in the quotient requires careful attention..002)684..002)68.4.002)6.84.002).684 If we study the above examples, and prove any one of them by multiplying the divisor and quotient together to see if the product is equal to the dividend, we shall see much that is like what we have already learned. There are two methods of locating the decimal point in the quotient. You do not need to remember both methods, but you should select the method which you understand and can use without making mistakes...
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