Addition with small number rods
From wikisori
Revision as of 05:02, 22 October 2008 by WikiAdmin (talk | contribs) (New page: ==Addition with small number rods== === Age === 3-6 <br /> === Materials === <ol><li>Two sets of Small Number Rods.</li><li>Plain squared paper and pencil.</li><li>Addition Sign Cards (opt...)
Contents
Addition with small number rods
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.
Variation
Handouts/Attachment