Three Meanings of Fractions
Three Meanings of Fractions
1. Part-Whole
This is the most common understanding of fractions. A fraction such as ¾ represents a whole which has been partitioned into 4 equal parts and 3 of those parts are being considered.
Part-Whole relationships can be shown by models of region, length, set, and area.
Region
• The most concrete model and most often used.
• The region is the whole 9 (the unit) and the parts are congruent (same shape and size)
• When presenting the region model a variety of shapes should be used so students don’t think of fractions as piece of a pie.
• The rectangle is the easiest model for children to draw and partition.
• The circle is easiest to see as a whole.
The whole
| | | | | |
3/5
Length (linear model)
• Any unit of length can be partitioned into equal parts.
• Folded strips of papers work well..
• Rulers are examples of linear models.
• Transfers easily to fractions on a number line
1 2 3 4 5
Length of model 4 1/3
Set
• Uses a set of objects as a whole (unit).
• Without mentioning fractions students should have many opportunities to partition sets – background for both fractions and division. Can 15 toys be partitioned (shared) among 5 people? 4 people? 3 people? 2 people?
• Leads to understanding of questions What is two-fifths of 15? Etc.
• Many practical applications
Partitioned into 5 groups: (2/5)
Area
• This is a more complex model related to the region model.
• The parts must be equal in area, but not necessarily congruent. (white = the white in the other models)
2. Quotient
This meaning comes from division 3 ÷ 5 and also the partitioning illustration. It is this meaning that needs to be understood to change fractions to decimal notation.
3. Ratio
This meaning is conceptually different from the others, involving comparing two separate things. For example, if oranges are 3 for $1 the ratio is 3 to one (3:1, 3 to 1, 3/1). This can also be expressed as a quotient $1 ÷ 3 providing a per orange cost.
Notes on instruction
The Part-Whole meaning using the region model is a good place to start when introducing fractions, moving to other models – length, sets, and area. Then move to quotient and later ratio.
It is important to develop a balanced understanding connecting the model to symbols and words.
Model
| | | |
Symbol: 2/3 Word: two-thirds
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The whole = 15 [pic]
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