copyright © 2006 by monica yuskaitis 1 by monica yuskaitis, m.a.ed. subtraction mixed numbers 5 th...
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Copyright © 2006 by Monica Yuskaitis1
by Monica Yuskaitis, M.A.Ed.
Subtraction Mixed NumbersSubtraction Mixed Numbers55thth Grade Grade
Copyright © 2006 by Monica Yuskaitis2
Objective
• To be able to subtract mixed numbers with regrouping.
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To Subtract Mixed Numbers with Regrouping.
1) Regroup by borrowing one from the 5.
55
- 8
4 18
3
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To Subtract Mixed Numbers with Regrouping.
2) Change the 1 to 8/8.
55
- 8
4 18
88
3
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To Subtract Mixed Numberswith Regrouping.
3) Add the 1/8 plus the 8/8.
55
- 8
4 18
88+ = 9
8
3
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To Subtract Mixed Numbers withRegrouping.
4) Subtract the fractions.
55
- 8
4 18
88+ = 9
8
48
3
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To Subtract Mixed Numbers with Regrouping.
5) Subtract the whole numbers.
55
- 8
4 18
88+ = 9
8
48
3
1
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To Subtract Mixed Numbers with Regrouping.6) Simplify your fraction.
55
- 8
4 18
88+ = 9
8
48
3
1 ÷ 44 = 1
21
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Now you can do it!
297
49
679- =
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Subtract.
579-
Regroup byborrowing 1from the 5.
439
2
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Subtract.
579-
439
2
Changethe 1 to
9/9.
99
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Subtract.
579-
439
2
Add 3/9 +9/9.
99+ = 12
9
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Subtract.
579-
439
2
Subtract12/9 – 7/9.
99+ = 12
9
59
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Subtract.
579-
439
2
Subtract4 – 2.
99+ = 12
9
59
2
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Subtract.
645-
Regroup byborrowing 1from the 6.
515
1
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Subtract.
645-
515
1
Changethe 1 to
5/5.
55
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Subtract.
645-
515
1
Add 1/5 +5/5.
55+ = 6
5
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Subtract.
645-
515
1
Subtract6/5 – 4/5.
55+ = 6
5
25
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Subtract.
645-
515
1
Subtract5 – 1.
55+ = 6
5
25
4 Answer4 2/5
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Objective
• To be able to subtract mixed numbers with unlike denominators with regrouping.
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To Subtract Mixed Numbers with Regrouping.
1) Find the LCD or LCM of the denominators.
53
- 4
18
3
8
8
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To Subtract Mixed Numbers with Regrouping.
2) Find the equivalent fractions with 8 as a denominator.
53
- 4
18
3
1868
x 1x 1x 2x 2
=
=
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To Subtract Mixed Numbers with Regrouping.
3) Regroup by borrowing one from the 5.
53
- 4
4 18
3
1868
=
=
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To Subtract Mixed Numbers with Regrouping.
4) Change the 1 to 8/8.
53
- 4
4 18
3
1868
=
=
88
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5) Add the 1/8 and 8/8 together.
53
- 4
4 18
3
1868
=
=
88+ = 9
8
To Subtract Mixed Numbers with Regrouping.
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To Subtract Mixed Numbers with Regrouping.
6) Subtract the fractions.
53
- 4
4 18
3
1868
=
=
88+ = 9
8
38
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To Subtract Mixed Numbers with Regrouping.
7) Subtract the whole numbers.
53
- 4
4 18
3
1868
=
=
88+ = 9
8
38
1
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Get your white boards out!
13
79
59- =5 4
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Subtract.
523-
Use the shortcut to find theleast commondenominator.
39
29
9
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Subtract.
523-
Find theequivalent
fractions with9 as a
denominator.
39
2
1133
x
x 39=69=
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Subtract.
523-
Regroup byborrowing 1from the 5.
39
2
1133
x
x 39=69=
4
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Subtract.
523-
Change the1 to a fraction
with 9 as a denominator.
39
2
3969
=
= 99
4
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Subtract.
523- Add 3/9 + 9/9.
39
2
3969
=
= 99+
4=12
9
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Subtract.
523- Subtract 12/9
minus 6/9.
39
2
3969
=
= 99+
4=12
9
69
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Subtract.
523- Subtract 4
minus 2.
39
2
3969
=
= 99+
4=12
9
69
2
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Subtract.
523-
Simplify yourfraction.
39
2
3969
=
= 99+
4=12
9
69
2 33
÷ = 23
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Subtract.
523-
Your answeris 2 2/3.
39
2
3969
=
= 99+
4=12
9
69
2 33
÷ = 23
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