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Fractions Made Easy
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1995-03-22
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êêêMIXED NUMBERS, ADVANCED LEVEL
è In this section we will be looking at the four operations of addi-
tion, subtraction, multiplication, and division of signed fractions
and/or mixed numbers.ïA signed fraction is just a fraction with either
a plus or a minus sign attached to it like all the fractions in the In-
termediate Level.ïA mixed number is a combination of a whole number and
a fraction.ïFor example, six and three fourths is a mixed number.ïIt
can be expressed in numeric form as, 6 3/4.ïEvery mixed number can be
expressed as an improper fraction by multiplying the whole number times
the denominator of the fraction and adding the result to the numerator.
This sum is then placed over the denominator to get the equivalent of
the mixed number in improper fraction form.
Example 1)ïChanging a positive mixed number to improper fraction form.
êêêè3ê(6∙4 + 3)ê27
#êêê 6 -è=è─────────è=è──
êêêè4êè 4êë4
Example 2)ïChanging a negative mixed number to improper fraction form.
êêêè2ê-(3∙5 + 2)ê-17
#êêë - 3 ─è=è──────────è=è───
êêêè5êë5êë 5
It is very important that the minus sign is placed outside of the paren-
çs in the first step.ïThus, every mixed number can be expressed as
an improper fraction.ïThis is basically how we will work with mixed
numbers.ïWe will change them to improper fractions, then add, sub-
tract, multiply, or divide like we did in the Intermediate Level.ïThis
process will be described in one rule after we look at a complete list
of all fractions.
êêêêïFractions
#êë ... -╩ï-╔è╚è╔è╩è╦è╠è═è╬ ...
êêè 1è1è1è1è1è1è1è1è1
#êë ... -╩ï-╔è╚è╔è╩è╦è╠è═è╬ ...
êêè 2è2è2è2è2è2è2è2è2
#êë ... -╦ï-╔è╚è╔è╩è╦è╠è═è╬ ...
êêè 3è3è3è3è3è3è3è3è3
êêêê.
êêêê.
êêêê.
Rule 8)ïTo add, subtract, multiply, or divide a combination of mixed
numbers and/or signed fractions, you should change all mixed numbers
to improper fraction form then perform the operations as we did in
the Intermediate Level.
Example 3)
ë1ë2ê-25è8ê-75è64ê-75 + (-64)ê-139
# - 3 ─ - 2 ─è=è─── - ─è=è─── - ──è=è───────────è=è────
ë8ë3ê 8è 3ê 24è24êè 24êê24
Example 4)
ê 1ë2ë-25è8ê-75è64ë -75 + 64ê-11
#è - 3 ─ + 2 ─ï=ï─── + ─è=è─── + ──ï=è────────è=è───
ê 8ë3ë 8è 3ê 24è24êè24êè24
Example 5)
ê 1ë3ê4è13ê4 ∙ 13ê52êè 7
#ë 1 ─ ∙ 2 -è=è- ∙ ──è=è──────è=è──èorè3 ──
ê 3ë5ê3è 5ê3 ∙ 5ê 15êè15
Example 6)
ë1è 5ê -5è 5ê-5è12ê-5∙12ê-3
# - 1 ─ ÷ ──è=è ── ÷ ──è=è── ∙ ──è=è─────è=è──è=è-3
ë4è12êï4è12ê 4è 5ê 4∙5êï1
è Leon the Fraction Wizard prefers to use the above method to perform
addition and subtraction of mixed numbers, but many people would rather
add or subtract mixed numbers in a column.ïThis is also a very good way
to perform ç two operations.ïOne advantage is that you can add or
subtract the whole numbers and the fractions separately.
Example 7)
êêê 3êêêê21
#êêë 2 -ë=ë2 ──ë=ë2 ──
êêê 5êë 35êë 35
êêê 1êêêê 5
#êêè+ï5 -ë=ë5 ──ë=ë5 ──
êêê 7êë 35êë 35
#êêè───────ê ───────ê ───────
êêêêêêêï26
#êêêêêêê7 ──
êêêêêêêï35