The document outlines a lesson plan focused on adding and subtracting fractions with unlike denominators, emphasizing the importance of finding common denominators. It includes examples of word problems involving fractions and provides steps for both addition and subtraction. Additionally, practice questions and answers are featured, helping students reinforce their understanding of the concepts presented.

1. fractions
as equal parts

2. Lesson Outcomes
• Add fractions with unlike denominators
• Subtract fractions with unlike
denominators
• Solve word problems

3. whole
number
proper fraction
Unlike Fractions Mixed Number
_
1
4
1
5
_
and
different denominators
fractions that have different
denominators
_
1
3
2
Let's Recall
a combination of a whole number
and a proper fraction

4. Danni ate 1/2 of a
slice of
watermelon.
Kai ate 1/6 of a
slice of
watermelon.
How much watermelon did
Danni and Kai eat
altogether?
Let's go on a
picnic!

5. 1
2
1
2
_ 3
6
_
×
3
×
3
_ +
1
6
_
3
6
_
Danni ate 1/2 of her watermelon, and
Kai ate 1/6. How much did they eat in
total?
Equivalent Fractions
Step 1: Find a common factor.
Adding Unlike Fractions

6. Danni ate 1/2 of her watermelon, and
Kai ate 1/6. How much did they eat in
total?
Step 2: Add the fractions.
Adding Unlike Fractions
Add the numerators
and keep the
denominators the
same.
+
+
1
6
_
1
2
_
3
6
_ 1
6
_ =
4
6
_

7. Ellis took 3/4 kg of lemons to make lemonade. She
only used 2/3 of the lemons. How much did she
have left?
Step 1: Find a common multiple.
Subtracting Unlike Fractions
3
4
9
1
2
×
3
×
3
Equivalent Fractions
2
3
8
1
2
×4
×4
Equivalent Fractions
3
4
-
-
2
3
9
12
8
12
_ _ _ _

8. Ellis took 3/4 kg of lemons to make lemonade. She
only used 2/3 of the lemons. How much did she
have left?
Step 2: Subtract the fractions.
Subtracting Unlike Fractions
Subtract the numerators and
keep the denominators the
same.
3
4
-
-
2
3
9
12
8
12
=
1
1
2
_

9. 3
4
-
-
2
3
9
12
8
12
=
1
1
2
_
1
Let's have a recap!
Before adding or subtracting
fractions, they must have the same
denominator. So, we must find a
common multiple.
Add or subtract the numerators and
keep the denominators the same.
2

10. Let's try these!
8
_
5
4
_
1
Sam lives km away from school, while Zac lives km away from
school.
How much farther is Sam's house than Zac's house from the school?
1.
7
_
3
Farmer Ren has kg of papaya, while farmer Neil has kg of papaya.
How many kilograms of papaya do they have altogether?
2
_
1
2.

11. Let's try these!
1.
2.
_ _ _
-
=
-
5
8
_
5
8
2
8
_
1
4
=
3
8
Sam's house is 3/8 km
farther than Zac's house.
+
=
+
6
14
3
7
_
_ 7
1
4
1
2
_
_ =
13
14
_
Farmer Ren and
Farmer Neil have a
total of 13/14 kg of
papaya.
Answer
Key

12. Reference
Mathspace. “7.03 Add and subtract fractions with models | Grade 5 Math
| Common Core 5 - 2022 Edition.” Accessed 5 June 2023,
https://mathspace.co/textbooks/syllabuses/Syllabus-1091/topics/Topic-
21215/subtopics/Subtopic-274732/?searchString=

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