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Multiplying and Dividing Decimals

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... decimal point in the product so that it has that same number of decimal places. ... Divide as you would with whole numbers, and place the decimal point in the ... – PowerPoint PPT presentation

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Title: Multiplying and Dividing Decimals


1
Multiplying and Dividing Decimals
2
To multiply 2 decimal numbers
  • Multiply as you would whole numbers
  • Count the total number of digits to the right of
    the decimal points in the 2 numbers being
    multiplied. Place the decimal point in the
    product so that it has that same number of
    decimal places.

3
Multiply 42.6 x 1.73
1 place
2 places
.
3 places
4
To divide 2 decimal numbers
  • Use the same form as in dividing 2 whole numbers
  • Multiply both divisor and dividend by a power of
    10 (move the decimal point) that makes the
    divisor a whole number.
  • Divide as you would with whole numbers, and place
    the decimal point in the quotient directly above
    the decimal point in the dividend.

5
Divide 75.1 by 1.62 and round to the nearest
hundredth.
6
A 23-ft I-beam is to be divided into 4 equal
parts. What is the length of each piece?
7
A small plane flies 277.5 mi in 2.5 h. How fast
did the plane fly?
8
If the cost of a metal duct with dimensions is
16.60 for four feet, how much is it per foot?
9
A 35.95 in. long steel rod is to be cut into
pieces 3.56 in. long. Each cut wastes 0.15 in. of
rod in shavings. If 9 pieces are cut from the
rod, how many inches of the rod are left?
10
How many metal sheets are in a stack that
measures 22.5 in. high if each sheet is 0.045 in.
thick?
11
Each cut on a lathe is 0.018 in. deep. How many
cuts would be needed to turn down 4.562-in. stock
to 4.220 in.?
12
A nurse gives three tablets of ephedrine,
containing 0.75 grains each. How many grains are
given?
13
A nurse gives three tablets of ephedrine making a
total of 0.75 grains. How many grains are in each
tablet?
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