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Subtract mixed numbers: Write answer in simplest form.

6 1/5 - 2 2/3=

2007-11-25 05:55:13 · 9 answers · asked by Anonymous in Science & Mathematics Mathematics

9 answers

6 1/5 - 2 2/3

31/5 - 8/3

93/15 - 40/15

53/15

3 8/15

2007-11-25 05:58:41 · answer #1 · answered by ben e 7 · 1 1

There are a number of ways to add/subtract mixed numbers.

WAY 1: Converting into an Improper fraction

6 1/5 - 2 2/3 becomes 31/5 - 8/3
Multiply denominators to get common denominator: (3 • 5 = 15), then cross multiply to get numerators:

(31 • 3) - (8 • 5)/15 ==> (93 - 40)/15 ==> 53/15 (<-- answer)

To turn 53/15 into a mixed number, divide 53 by 15. The remainder will be your numerator and the denominator stays the same:

53 ÷ 15 = 3 r8 ==> 3 8/15

WAY 2: Direct Subtraction.

Step 1: Find Common Denominator

Since we've established it was 15, we'll use it:

6 3/15 - 2 10/15

Since we can't subtract 3/15 from 10/15, we'll need to "borrow" from the "big number":

6 3/15 ==> 5 3/15 (+ 15/15)* ==> 5 18/15
(*NOTE: since we took 1 from the 6, it became 5: [6 - 1 = 5] and we made 1 = 15/15 because 15 is the common denominator).

Now we can subtract:

5 18/15 - 2 10/15

3 8/15

Hope it helped :-)

2007-11-25 06:18:06 · answer #2 · answered by Jacob F 5 · 1 0

6 1/5 - 2 2/3= 6 3/15 - 2 10/15 = 5 18/15-2 10/15 = 3 8/15

2007-11-25 06:00:03 · answer #3 · answered by ironduke8159 7 · 1 1

1. convert both the fractions 31/5 - 8/3 =
2. multiply through by the common denominator in this case 3 x 5 = 15 -> (93 - 40) / 15 =
3. then solve, simplify and change back to mixed

2007-11-25 06:04:22 · answer #4 · answered by Nigel M 6 · 1 0

3 8/15

2007-11-25 06:05:09 · answer #5 · answered by Will T 3 · 1 0

Turn them into improper fractions:
31/5-8/3

15 is the common denominator:
(31*3)/(5*3)-(8*5)/(3*5)=
93/15-40/15=
53/15=
3 8/15

2007-11-25 06:04:52 · answer #6 · answered by Anonymous · 0 0

31/5 - 8/3 = 53/15

because

93/15 - 40/15 = 53/15

2007-11-25 05:58:34 · answer #7 · answered by TS 2 · 1 1

31/5-8/3=93/15-40/15=
53/15

2007-11-25 06:00:08 · answer #8 · answered by madhavan n 6 · 1 1

61/5 -22/3= [ 61*3 -22*5]/15=(183-110)/15= 73/15.

2007-11-25 06:07:20 · answer #9 · answered by Sasi Kumar 4 · 0 1

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