Manipulative (mathematics)

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Cuisenaire rods in a staircase arrangement
Interlocking "Multilink" cubes

In mathematics, a manipulative is an object which is designed so that a learner can perceive some mathematical concept by manipulating it, hence its name. The use of manipulatives provides a way for children to learn concepts in a developmentally appropriate, hands-on and an experiencing way. The use of manipulatives in mathematics classrooms throughout the world grew considerably in popularity throughout the second half of the 20th century. Mathematical manipulatives are frequently used in the first step of teaching mathematical concepts, that of concrete representation. The second and third step are representational and abstract, respectively.

Mathematical manipulatives can be purchased or constructed by the teacher. Examples of commercial manipulatives include tangrams; Cuisenaire rods; numicon[1] patterns; Diene's blocks (or multibase blocks);[2] interlocking cubes; color tiles;base ten blocks; pattern blocks; colored chips;[3] links; fraction strips,[4] blocks, or stacks; Shape Math;[5] Polydron; Zometool; and geoboards. Examples of teacher-made manipulatives used in teaching place value are beans and bean sticks or bundles of ten popsicle sticks and single popsicle sticks.

Virtual manipulatives for mathematics are computer models of these objects. Notable collections of virtual manipulatives include The National Library of Virtual Manipulatives and the Ubersketch.

Multiple experiences with manipulatives provide children with the conceptual foundation to understand mathematics at a conceptual level and are recommended by the NCTM.

Some of the manipulatives are now used in other subjects in addition to mathematics. For example, Cuisenaire rods are now used in language arts and grammar, and pattern blocks are used in fine arts.

In teaching and learning[edit]

Mathematical manipulatives play a key role in young children’s mathematics understanding and development. These concrete objects facilitate children’s understanding of important math concepts, then later help them link these ideas to representations and abstract ideas. Here we will look at pattern blocks, interlocking cubes, and tiles and the various concepts taught through using them. This is by no means an exhaustive list (there are so many possibilities!), rather, these descriptions will provide just a few ideas for how these manipulatives can be used.

Pattern blocks[edit]

One of the ways of making a dodecagon with pattern blocks

Pattern blocks consist of various wooden shapes (green triangles, red trapezoids, yellow hexagons, orange squares, tan (long) rhombi, and blue (wide) rhombi) that are sized in such a way that students will be able to see relationships among shapes. For example, three green triangles make a red trapezoid; two red trapezoids make up a yellow hexagon; a blue rhombus is made up of two green triangles; three blue rhombi make a yellow hexagon, etc. Playing with the shapes in these ways help children develop a spatial understanding of how shapes are composed and decomposed, an essential understanding in early geometry.

Pattern blocks are also used by teachers as a means for students to identify, extend, and create patterns. A teacher may ask students to identify the following pattern (by either color or shape): hexagon, triangle, triangle, hexagon, triangle, triangle, hexagon. Students can then discuss “what comes next” and continue the pattern by physically moving pattern blocks to extend it. It is important for young children to create patterns using concrete materials like the pattern blocks.

Pattern blocks can also serve to provide students with an understanding of fractions. Because pattern blocks are sized to fit to each other (for instance, six triangles make up a hexagon), they provide a concrete experiences with halves, thirds, and sixths.

Adults tend to use pattern blocks to create geometric works of art such as mosaics. There are over 100 different pictures that can be made from pattern blocks. These include cars, trains, boats, rockets, flowers, animals, insects, birds, people, household objects, etc. The advantage of pattern block art is that it can be changed around, added, or turned into something else. All six of the shapes (green triangles, blue (thick) rhombi, red trapezoids, yellow hexagons, orange squares, and tan (thin) rhombi) are applied to make mosaics.

Interlocking cubes[edit]

Interlocking centimeter cubes

Interlocking cubes (or mathlink cubes) are usually one cm3 cubes that connect with each other from all sides. There is also a tool called “unifixed cubes” that are the same size, but only connect from the top to the bottom. They come in a wide variety of colors.

Like pattern blocks, interlocking cubes can also be used for teaching patterns. Students use the cubes to make long trains of patterns. Like the pattern blocks, the interlocking cubes provide a concrete experience for students to identify, extend, and create patterns. The difference is that a student can also physically decompose a pattern by the unit. For example, if a student made a pattern train that followed this sequence, Red, blue, blue, blue, red, blue, blue, blue, red, blue, blue, blue, red, blue, blue.. the child could then be asked to identify the unit that is repeating (red, blue, blue, blue) and take apart the pattern by each unit.

Also, one can learn addition, subtraction, multiplication and division, guesstimation, measuring and graphing, perimeter , area and volume.[6]

Tiles[edit]

Tiles are one inch-by-one inch colored squares (red, green, yellow, blue).

Tiles can be used much the same way as interlocking cubes. The difference is that tiles cannot be locked together. They remain as separate pieces, which in many teaching scenarios, may be more ideal.

These three types of mathematical manipulatives can be used to teach the same concepts. It is critical that students learn math concepts using a variety of tools. For example, as students learn to make patterns, they should be able to create patterns using all three of these tools. Seeing the same concept represented in multiple ways as well as using a variety of concrete models will expand students’ understandings.

Number lines[edit]

To teach integer addition and subtraction, a number line is often used. A typical positive/negative number line spans from -20 to 20. For a problem such as “-25 + 17”, students are told to “find -25 and count 17 spaces to the right” giving the feeling that -25 is a stationary number while 17 some sort of movement. Though this method will give the correct answer “-8”, it may not be the way we would approach the problem if it were in a word problem. Moreover, "to the right" has no intrinsic meaning of "more" or "add" and would get confusing when subtracting negatives.

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