1. 4.878X3.816
2. 67.50X1200
3. 1.008X4.004
4. .047 X-75
5. 6.004X3.07
6. .0101X6.06
7. 4.072X-004
8. 16.32X2.020
9. .1672X6.204 10. 72.04X-09
THE NEW STUDENT'S REFERENCE WORK 2161
EXEECISE 12.
DIVISION OF DECIMALS.
To divide a decimal by 10, move the decimal point one place to the left.
To divide a decimal by 100, move the decimal point two places to the left.
Divide the following by 10, by 100, by 1000, by moving the decimal point:
.4 1.406 8.04 75.06
.25 24.08 6.003 54.04
.405 .5825 .62 112.5
Divide 601.26 by 600.
First divide the dividend by 100 by moving the decimal 1.0021 point two places to the left, then divide by 6, placing the 6)6.0126 decimal point in the quotient directly over the decimal point in the dividend.
EXEECISE 13.
1. 74.40—60
2. 680.4—4200
3. 128.-800
4. 15540.—7000 8—4=2.
5. 46.40—40
6. 43.2—2400
7. 24.64—1100
8. 9.—600
Multiply both dividend and divisor by 2.
16-^-8=2 and the quotient is the same.
Multiplying both dividend and divisor by the same number does not change the quotient.
This is a most valuable principle to remember, and it is used in the following examples:
Divide 1.806 by .43.
Multiply both dividend and divisor by 100 by moving the decimal point two places to the right. This makes the divisor a whole number. Place the decimal point in the quotient directly over the decimal point thus established in the dividend.
4.2
.43^)1.80^6 172
86 86
