It’s no secret that fractions are a very difficult concept for students to understand. But why is that? Fractions are an extremely abstract concept, and without adequate concrete and representational experiences that build fraction number sense, students do not develop mental images of what the abstract symbols mean.
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In Texas, students begin formal fraction instruction in 2nd grade under our TEKS, but the symbolic notation for fractions (1/4, 2/3, etc.) is not taught until 3rd grade. The 2nd grade standards include:
- partition objects into equal parts and name the parts, including halves, fourths, and eighths, using words
- explain that the more fractional parts used to make a whole, the smaller the part; and the fewer the fractional parts, the larger the part
- use concrete models to count fractional parts beyond one whole using words and recognize how many parts it takes to equal one whole
Let’s take a closer look at each.
Partition into equal parts and name the parts
The most fundamental understanding about fractions is that the parts must be equal. Children have a basic understanding about equal parts prior to formal instruction on fractions. They know that when they are sharing a sandwich, for instance, the parts should be the same size for it to be fair.
Count fractional parts using concrete models
Students should also see a variety of representations for fractions. In the pictures above, I’ve used foam fraction circles, but you can also use Cuisenaire rods, fraction tiles or fractions strips. Click here to download both color and B & W fraction strips.
More parts = smaller pieces
Did you groan when you looked at the graphic above because you’ve had so many students tell you 1/8? That is such a common misconception. Without concrete and pictorial experiences seeing pieces of both sizes, students revert to what they know about whole numbers—a bigger number is bigger. Using that reasoning, 1/8 must be bigger, because 8 is greater than 4.
I’m a big fan of number bonds. The part/whole understanding students develop when they work with number bonds is an essential component of being able to work flexibly with numbers. Some time back, I wrote a blog post about how number bonds evolve through more complicated math concepts, and fractions was one of the examples I used. In the example shown below, if students know they need 2 more fifths to make a whole and that they can get those 2 fifths by decomposing the 4 fifths, it sure makes improper fractions and mixed numbers a whole lot simpler. Typically, we teach procedures for adding fractions and converting the sum to a mixed number, and students often follow the steps with no real understanding. Worse yet, they add the denominators and end up with 7 tenths!
Students would, of course, experience this concept first with concrete materials, and it might look and sound something like this:
Then, I thought, why not develop number bond cards for fractions? And that’s exactly what you see pictured. The traditional number bond card is on the left with the fraction number bond card on the right.
Here’s the prep work…
f you know me, you know these fraction number bond cards are going to be hole-punched and put on O-rings! Don’t hole punch them with a single hole punch, though—use your 3-hole punch! It’s so much easier, and your holes line up nicely.
The finished product! I actually put the halves, thirds, and fourths on one O-ring and the sixths and eighths on another. Much more manageable that way.
Students need lots of practice with this concept. And what makes practice engaging and meaningful? GAMES! The games shown here are from Fishing “Whole”: Composing and Decomposing Fractions, which also includes the fraction number bond cards.
There are 24 cards like the ones shown that can be used to play either Memory or Go Fish. The goal is to find two cards that make a whole.
The card shows 1 eighth. I would ask my partner, “Do you have 7 eighths?”, because 1 eighth and 7 eighths make a whole. If he does, he hands it over and I lay down the pair. If he doesn’t, he says, “Go fish!”.
The other game is a Scoot game. Card 19 shows 4 sixths. It takes 2 more sixths to make a whole, so I’d write 2 sixths in space 19. It’s typically played whole class, but it’s also a great workstation.
I hope this post has provided you with some useful information! I’d love to hear your comments.