THE NEW STUDENTS REFERENCE WORK 2159
DECIMAL FRACTIONS.
Decimal fractions, usually called decimals, express one or more of the decimal divisions of a unit. Decimal fractions are generally expressed by writing the numerator only, the denominator being shown by the position of the decimal point, as illustrated by the following: .4 four tenths.
.04 four hundredths.
.004 four thousandths.
.0004 four ten-thousandths.
.00004 four hundred-thousandths. ,000004 four millionths.
Eead the decimal as if it were a whole number, then add the name of the place of the right-hand figure.
A whole number with a decimal is called a mixed decimal. In reading a mixed decimal, use the word and between the whole number and the decimal.
Much drill in reading and writing decimals is desirable. Bead the following:
.408 .0050 32.037 .000058
.0506 .00401 20.070 .000506
.0458 .02000 9.009 .002600
Express the following in decimal form: 3 5 ^L ®L 32° 475 _4 4
To To Too Too looo Tooo 8To 32ioo
7 tenths 425 thousandths 8 and 6 tenths
8 hundredths 62 thousandths 12 and 6 hundredths 32 hundredths 6 thousandths 15 and 6 thousandths
ADDITION AND SUBTRACTION OF DECIMALS.
Use same method as in whole numbers. Arrange units of the same order in the same column. Keep the decimal points one under another.
Place the decimal point in the answer directly under the decimal points in the example.
EXEECISE 10. Addition:
1. 2.457+3.576+8.01+.4592+82.4070
2. 9.423+732.01+62.+8.4067+4.04863
3. 24.84+8.531+.4004+6.07
4. 14.4278+3.042+2.0046+.8795+3.6745+.297
5. 2.243+5.1462+3.0481+.72546+.04652
