Zone d’entraide

PinkRuby129

Hi!

I don't understand this :

Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

Can someone please tell me how to these problems and the answers?

Thank you!

PinkRuby ☆

FauconOmicron4707

Hello,

thanks for your question!

In the first problem, you need to use the concept of multiplying a fraction by a whole number. I recommend checking out the following information sheets :

https://www.alloprof.qc.ca/en/students/vl/mathematics/multiplying-a-fraction-by-a-whole-number-elementary-m1607

In the second problem, you need to divide the fraction by 2 because there are two cakes. To divide fractions, you have to multiply by the reciprocal. In other words, the numerator and denominator are flipped. Here, the number 2 is equivalent to the fraction 2/1. When inverted, it becomes 1/2. Then, you need to multiply the two fractions to find the amount of flour in each cake.

Here's an information sheet that might help you:

https://www.alloprof.qc.ca/fr/eleves/bv/mathematiques/la-division-de-fractions-m1383

I hope I was able to help you. Feel free to ask if you have any other questions!

Zachary T. :)