Math in Real Life: Yummy Crepes and Ratios

by | Dec 2, 2018

Have you ever had a late night craving you can’t seem to kick? That was me the other night! I had a craving for crepes, plus my grocery store had strawberries on sale!  Score!!  I went right home and searched for a new crepe recipe that works better with my awesome crepe maker.  As I browsed Pinterest, I found this one that worked out oh so nicely

Math in Real Life: Yummy Crepes and Ratios

The picture definitely grabbed my attention.  Doesn’t it look divine??  Maria of The Mother Huddle knows what she’s doing in the kitchen.  I have to admit though, sometimes I really hate trying recipes from Pinterest…they usually don’t turn out or the directions are vague with too many assumptions (ie: add one can–I am wondering what size of can?? Sheesh!)  This picture made me excited to try again!

Making a Ratio Table to Adjust the Recipe

I got the ingredients out and noticed that I had 4 eggs, but the recipe called for only 3.  I really didn’t want to waste that one egg, so my mind turned to RATIOS!  Yes, I set up a ratio table so I could adjust the ingredients to 4 eggs and use that last one.

Here is the original recipe:

  • 1/3 tsp salt
  • 3 eggs
  • 1-1/2 cups milk
  • 1-1/2 cups all-purpose flour
  • 2 Tbsp vegetable oil or melted butter

I needed to find out the measurements for one egg per every ingredient.  I divided all of the ingredients by 3 to find that answer as shown in my ratio table below.  The egg is my unit measurement.

Math in Real Life: Yummy Crepes and Ratios

After I found those amounts, I added them straight down the columns…making sure to change all denominators into like denominators so I could add.

Math in Real Life: Yummy Crepes and Ratios

Finding Equivalent Fractions

So, you may be thinking 4/9 of a tsp is kind of a weird measurement!  I would agree, but let’s reason through how I would add it to the mix.

  • If I look at the original measurement for 1/3 tsp of salt, I could in turn make that into an equivalent fraction of 3/9– which is close to 4/9.  I would measure out the original 1/3 tsp and add a pinch more.
  • Now for the 2/3 of a Tbsp, let’s use unit conversions here.  There are 3 tsps in 1 Tbsp. So you could use the tsp measurement and scoop it out twice.  1/3 Tbsp (1 tsp) + 1/3 Tbsp (1 tsp) = 2/3 Tbsp.

The results were fantastic!  The batch made the perfect amount of crepes for my family.  There were just enough and no left overs. I love this recipe and I hope you’ll try it out at home… and make a GIANT batch.  Math really is everywhere!


Math in Real Life: Yummy Crepes and Ratios
Adrianne Meldrum

Adrianne Meldrum

Owner of Math for Middles

I’m the owner and creator of the math videos here at Math for Middles.  I’ve tutored students for over ten years.  When I am not creating here, you’ll find me down by the river with my family.  Interested in working with me?  Connect with me here.

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