Subtraction of Decimals
Keep the decimal points in a vertical line.
Multiplication of Decimals
The number of places to point off from the
right in the product is found by adding the number
of places in the multiplicand and the multiplier.
Division of Decimals
Division means to determine how many
divisors are equivalent to the dividend.
DIVIDEND + DIVISOR = QUOTIENT
Make the divisor a whole number by moving
the decimal point to the right of the last figure.
Move the decimal point in the dividend as
many digits to the right as it was move in the
Place the decimal point in the quotient
(answer) directly above the new position of the
decimal in the dividend.
Example: Divide 510 by 25.5
Helpful Hints When Multiplying or
Dividing by Decimals
To multiply by 10, move the decimal point one
place to the right. To multiply by 100, move the
decimal point two places to the right. In other
words, move the decimal point to the right to coin-
cide with the number of zeroes in the multiplier
when it is stated in the 10s.
Division by powers of 10 require moving the
decimal point to the left by one place for each zero
that appears in the divisor.
Changing a Decimal to a Common Fraction
Write the denominator in the power of 10 and
reduce to lowest terms.
Examples: 0.8 would be 8/10 reduced to 4/5
0.04 would be 4/100 reduced to
A fraction is an expressed PART of a unit.
The parts of a fraction are the:
NUMERATORthe first or upper part of a
fraction that indicated the number of the equal
parts of a unit concerned.
DENOMINATORindicates the number of
parts into which a unit is divided and constitutes
the second or lower part of a fraction.
Types of Fractions
Proper fractiona fraction whose numerator
is less than the denominator.
Examples: 1/2, 6/11, 22/75, 41/111
Improper fraction a fraction whose
numerator is equal to or greater than the
Examples: 3/3, 15/10, 45/30, 101/9
Mixed numbersa whole number combined
with a fraction.
Examples: 1 1/2, 2 3/5, 55 7/10