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Adding and Subtracting Fractions bottom numbers same

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Presentation on theme: "Adding and Subtracting Fractions bottom numbers same"— Presentation transcript:

1 Adding and Subtracting Fractions bottom numbers same
3 Add the top numbers 5 2 fifths PLUS 1 fifth = 3 fifths ÷ 2 6 3 Subtract the top numbers Simplify answer = 8 4 7 eighths MINUS 1 eighth = 6 eighths

2 Adding and Subtracting Fractions bottom numbers same
Add the top numbers Always simplify answer if possible Subtract the top numbers

3  Adding and Subtracting Fractions bottom numbers different 10 3 2 3
2 x 5 3 x 1 10 3 2 3 6x table 6 12 4x table 4 8 12 How many? How many? Find the LCM Re-write the fractions How many ? then multiply Calculate answer Simplify if possible

4 Adding and Subtracting Fractions bottom numbers different
Find the LCM Re-write the fractions How many ? then multiply Calculate answer

5  Multiplying Fractions 3 10 1 2 Cross-cancel if possible
Multiply tops Multiply bottoms Simplify if possible 1 3 10 2

6 Multiplying Fractions
Cross-cancel if possible Multiply tops Multiply bottoms Simplify if possible

7 MUST re-write the question
Dividing Fractions MUST re-write the question Write down the first fraction Change ÷ to x Invert the second fraction Cross-cancel if possible Multiply tops Multiply bottoms Simplify if possible 3 27 x 28 4

8 MUST re-write the question
Dividing Fractions MUST re-write the question Write down the first fraction Change ÷ to x Invert the second fraction Cross-cancel if possible Multiply tops Multiply bottoms Simplify if possible

9 Change mixed numbers into top-heavy fractions
Multiplying Fractions working with mixed numbers Change mixed numbers into top-heavy fractions Cross-cancel if possible Multiply tops Multiply bottoms Simplify if possible 2 x 8 plus 5 2 x 9 plus 2 5 7 35 6 3 2

10 Dividing Fractions working with mixed numbers
Change mixed numbers into top-heavy fractions MUST re-write the question Write down the first fraction Change ÷ to x Invert the second fraction Cross-cancel if possible Multiply tops Multiply bottoms Simplify if possible

11 Adding Fractions working with mixed numbers
3 + 2 = 5 12 15 4 5 Add the whole numbers Add the fractions find LCM how many .... ? multiply Calculate answer Simplify if possible Combine answers How many? How many?

12 Adding Fractions working with mixed numbers
Add the whole numbers Add the fractions find LCM how many .... ? multiply Calculate answer Simplify if possible Combine answers

13 Subtracting Fractions working with mixed numbers
plus 1 164 70 4 10 Change to top heavy fractions Find LCM Re-write the fractions How many .... ? then multiply Calculate answer Simplify if possible How many? How many?

14 Subtracting Fractions working with mixed numbers
Change to top heavy fractions Find LCM Re-write the fractions How many .... ? then multiply Calculate answer Simplify if possible

15 Fraction OF 60 £60 1 20 1 Replace of with x Cross-cancel if possible
Multiply tops Multiply bottoms Simplify if possible 60 £60 1 Remember £ sign 1

16 Fraction OF Replace of with x Cross-cancel if possible Multiply tops
Multiply bottoms Simplify if possible Remember £ sign


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