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Two 10-piece sets of small wooden rods divided into units by alternating colors of red and blue. The rods are constant in height and width (1 cm) while graduated in length from 2.5 cm to 25 cm.
The rods are presented in a wooden box that includes one set of wooden number tiles 1-10.
Similar to the regular-size Numerical Rods, but these small rods come in a set of 2 for use in addition and subtraction.
Recommended ages: 4 years and up.
Age
3-6
Materials
- Two sets of Small Number Rods.
- Plain squared paper and pencil.
- Addition Sign Cards (optional).
Preparation
Presentation
Presentation 1:
- The Directress invites the child to build two stairs with the number rods.
- The rods on the left act as control of error and the rods on the right are used for addition purpose.
- So, the Directress takes a rod from the left, counts them, for e.g. a rod 7.
- Then she invites the child to choose a rod that is shorter than 7.
- The Directress directs the child to choose from the right set of rods.
- The child chooses a rod, for e.g. a 5 rod.
- Then the Directress places the 5 rod just below the 7 rod, and then says, "how many more to make 7?"
- The child then counts out the number rod to make 7 based on the 7 rod which acts as control of error and would probably answer "2".
- Then the child takes a 2 rod and places it besides the 5 rod below the 7 rod and would find them at equal length.
- Directress then explains, "5 plus 2 makes 7" and then shows the child how to write "5 2=7" on plain square paper.
- The Directress can continue the presentation by showing a few more examples.
Control Of Error
The Rods themselves act as a Control of Error because the quantities are fixed.
Points Of Interest
As a preparation to learn Number Bonds, when doing the above exercise, we could always exchange places between the 2 addition rods and reinforce that, for e.g. 5 2=7 and 2 5=7 as well.
Exercises should not be called 'sums' as in correct mathematical language the 'sum' is the answer to an addition question. We use 'exercise or 'example' instead.
Purpose
- Introduce the child to addition with numbers 1 to 10.
- Show the child how to record additions up to 10.
- Provide controlled exercises for teaching number bonds.
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