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
