Page 108 - Math Smart - 7
P. 108
Operations with decimals
Addition " Subtraction
Line up the decimai points
18.^200 Add zeros as placeholders
0.030 Add or subtract digits in 7 580
the columns
+0.004 -0.265
18 ,234 Insert a decimal point in 7,315
1 the answer in line with the
other decimal points
Multiplication X Division
Line up the digits, ignore the decimai Count the number of digits to
points, and multipy the right of the decimai points in
Count the number of digits to the right the problem to place the decimal
of the decimal points in the problem to point in the correct position in the
place the decimal point in the correct answer
position in the answer
2 digits to the right
221 .84
of the decimal point
7.04 2 digits to the right
of the decimal point
Place the decimal point
X3 2 digits from the right
10i9 2
21.12 Place the decimal point
2 digits from the right 2 21.84
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Mathematics Connect
A computer processes information in nanoseconds. A nanosecond is one
billionth of a second. One nanosecond is written as 0.000000001 seconds
in decimal form.
The smaller the speed, the faster the computer is able to access its i.i i;'i
memory. A computer processing at a speed of 10 nanoseconds is faster
than a computer operating at a speed of 60 nanoseconds.
An average computer now processes at a speed of 2 Ghz, which is 2 billion
processes/second, equating to 2 processes per nanosecond!
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UNIT 4 I Decimals
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