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2160                                                                  ARITHMETIC

Subtraction:

6.   624.278—125.564                14.    606.48—288.09

7.   863.581—132.472                15.    .8—.08

8.   145.6—64.58                       16.    65,800—19.014

9.   6.02—2.006                        17.    12.001—9.00046

10.   2.308—.0024                      18.    .4875—.22

11.   4.4—.62                             19.    .0375—.0028

12.   14.08—1.846                       20.    27.475—1.866

13.   .06—.025

MULTIPLICATION OF DECIMALS.

To multiply a decimal by 10, move the decimal point one place to the right.

To multiply a decimal by 100, move the decimal point two places to the right.

Multiply the following by 10, by 100, and by 1000 by moving the decimal point.

.4                       .046                     .008S                     .485

.25                      .845                     .062                       .0628

.405                    .476                     .0486                     .0082

Multiply 2.375 by 600.

First multiply the multiplicand by 100 by moving the decimal two places to the right. Then multiply by 6.

To multiply a decimal by a whole number, multiply as with

1425.0       whole numbers, and then point off as many places in the product as the multiplicand has decimal places.

EXEKCISB 11.

1.     4.856X400                               5. 261.1   X?200

2.     5.408X3200                             6. 34.0062X9000

3.   64.042X2000                             7. 100.65 X1200

4.   184.64X600                               8. .0048   X8000

Multiply 36.4 by .6. 36.4       This means to find T% of 36.4. 6           of 36.4 = 3.64.

21.84      T% = 6 X 3.64 = 21.84.

To multiply a decimal by a decimal, multiply as with whole numbers and point off as many decimal places in the product as there are in both multiplicand and multiplier together.

237.5 6