Multiplier et diviser des fractions Objectif. Multiply and divide fractions Objective.

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Transcription de la présentation:

Multiplier et diviser des fractions Objectif

Multiply and divide fractions Objective

Question Cooper a faim alors il ouvre le réfrigérateur et il voit un tier de pizza sur laquelle quelqu’un a déposé un papier disant « s’il vous plaît laisser un tier de ce morceau ».

Question Connor is hungry so he opens the fridge and notices a third of a pizza on which someone wrote a note that says « please leave a third of this piece »

Règle 1. Écris la question 2. Multiplie les numérateurs 3. Multiplie les dénominateurs 4. Réduis la fraction 2x5 76 2x5 = 10 7x  2=5 42  2 =21

Rule 1. Multiply the numerators 2. Multiply the denominators 3. Simplify the fractions if necessary. 2x5 76 2x5 = 10 7x  2=5 42  2 =21

Essayons ensemble 1. ¾ x ¾ = /5 x 2/7 = 3. 7/8 x 9/11 = 4. ½ x 3/7 = 5. 2/8 x 9/10 =

Let’s try together 1. ¾ x ¾ = /5 x 2/7 = 3. 7/8 x 9/11 = 4. ½ x 1 3/7 = 5. 2/8 x 9/10 =

En équipe: 1. 3/7 x 4/8 = /6 x 1/9 = 3. 2/7 x 1/5 = 4. 4/9 x 1/10 = /6 x 2/7 = 6. ¾ x 12/15 = 7. 18/20 x 10/5 =

In teams 1. 3/7 x 4/8 = /6 x 1/9 = 3. 2/7 x 3 1/5 = 4. 4/9 x 1/10 = /6 x 2/7 = 6. ¾ x 12/15 = 7. 18/20 x 10/5 =

Maintenant la division: 1. Écris la première fraction. 2. Inverse la deuxième fraction. (écris à l’envers) 1. Multiplie les fractions. 3  1 45 = 3x5 = 15=

Now the division: 1. Write the first fraction. 2. Invert the second fraction. (write upside down) 1. Multiply the fractions. 3  1 45 = 3x5 = 15=

Essayons ensemble 1. ¾  ¾ = 2. 4/5  2/7 = 3. 7/8  9/11 = 4. ½  3/7 = 5. 2/8  9/10 =

Let’s try together 1. ¾  ¾ = /5  2/7 = 3. 7/8  9/11 = 4. ½  1 3/7 = 5. 2/8  9/10 =

En équipe: 1. 3/7  4/8 = 2. 2/6  1/9 = 3. 2/7  1/5 = 4. 4/9  1/10 = 5. 4/6  2/7 = 6. ¾  12/15 = 7. 18/20  10/5 =

In teams 1. 3/7  4/8 = 2. 2/6  1/9 = 3. 2/7  1/5 = 4. 4/9  1/10 = 5. 4/6  2/7 = 6. ¾  12/15 = 7. 18/20  10/5 =

Individuellement: multiplie et divise 1. ¼ x ¼ = 2. 3/5  2/7 = 3. 2/3 x 1 2/5 = 4. 1/8  2/10 = 5. 4/5  3/6 = 6. 4/5  3/6 = 7. 2/7 x 4/9 = 8. ½ x 1/2 9. 2/4  2/4 = /3 x 2 ½ =

Individually: multiply and divide 1. ¼ x ¼ = 2. 3/5  2/7 = 3. 2/3 x 1 2/5 = 4. 1/8  2/10 = 5. 4/5  3/6 = 6. 4/5  3/6 = 7. 2/7 x 4/9 = 8. ½ x 1/2 9. 2/4  2/4 = /3 x 2 ½ =

Copier et compléter Voici un carré magique. Voici un carré magique. Pour le remplir tu dois respecter la règle de multiplication suivant les flèches. Pour le remplir tu dois respecter la règle de multiplication suivant les flèches.

Copy and complete Please fill this magic square. Please fill this magic square. Each square up is the result of the previous one timed by 2/3. Each square up is the result of the previous one timed by 2/3. Each square right is the previous times ½. Each square right is the previous times ½.