# Knobbed Cylinders

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Knobbed Cylinders
Sensorial - Visual Discrimination of Size
LevelPre-Primary
Primary
Age2.5 - 3.5
Prerequisiteseye-hand coordination
concentrarion
small muscle coordination
knobbed puzzles
Practical Life activities
Materialsknobbed cylinder block 1
knobbed cylinder block 2
knobbed cylinder block 3
knobbed cylinder block 4

Use of this material teaches the child visual discrimination of dimension. This activity also helps the child develop their pincer grip which is necessary for writing.

## Presentations

The cylinder blocks can be done at a mat or table. If you would like the child to work at a mat, have the child unroll the mat before getting the cylinder block.

1. Bring the child to the shelf and invite them to take the knobbed cylinder block.
2. Take the cylinder block to a mat or table and place the it at the top of the workspace. (Be sure the cylinder blocks are placed in the correct direction as shown in the pictures.)
3. Take out all the cylinders one at a time from left to right by holding the knob with a pincer grip. Place the at the bottom of the workspace in a random order.
4. Indicate that you are looking for the cylinder that fits in the left-most hole.
5. Select a cylinder you think will fit and try it in the first hole. If it doesn't fit, try a different one.
6. Continue until all of the cylinders are back in place.

## Points of Interest

• The cylinders fitting perfectly when in the correct place

## Purpose

### Direct Purpose

• To teach the child to distinguish small differences in size.

### Indirect Purpose

• Exercising the pincer grip
• Left to right direction (for reading)
• Cylinders in sets of ten prepares for base-ten number system

## Control of Error

The control of error lies within the materials itself.

• Seeing those that are too wide not fit
• Those that are too thin will not fit snugly
• Those that are too short or too tall will not be level
• At the least, the child will be left with one that does not fit in the end.

## Vocabulary

All Blocks: knob, cylinder

Block 1
- Establishment of Quality: large, small
- Comparatives: larger, smaller
- Superlatives: largest, smallest

Block 2
- Establishment of Quality: thick, thin
- Comparatives: thicker, thinner
- Superlatives: thickest, thinnest

Block 3
- No language

Block 4
- Establishment of Quality: tall, short
- Comparatives: taller, shorter
- Superlatives: tallest, shortest

## Material

Prices and links checked: 23 January 2022

Set of 4
Store Price
Affordable Montessori \$185.00
Alison's \$154.35
Alison's \$240.00
Bruins \$320.00
E & O \$207.00
Hello Wood \$353.00
IFIT \$125.00
Montessori Concepts \$153.00
Thinkamajigs \$189.95
Individual Blocks
Store Price
Alison's
block 1
\$50.00
Alison's
block 2
\$50.00
Alison's
block 3
\$70.00
Hello Wood
block 1
\$90.00
Hello Wood
block 2
\$90.00
Hello Wood
block 3
\$90.00
Hello Wood
block 4
\$90.00
Material Company of Boston
block 1
\$62.00
Material Company of Boston
block 2
\$62.00
Material Company of Boston
block 3
\$62.00
Material Company of Boston
block 4
\$62.00
Montessori Concepts
block 1
\$42.00
Montessori Concepts
block 2
\$42.00
Montessori Concepts
block 3
\$42.00
Montessori Concepts
block 4
\$42.00
Montessori Outlet
block 1
\$39.95
Montessori Outlet
block 2
\$39.95
Montessori Outlet
block 3
\$39.95
Montessori Outlet
block 4
\$39.95
Nienhuis
block 1
\$85.50
Nienhuis
block 2
\$85.50
Nienhuis
block 3
\$85.50
Nienhuis
block 4
\$85.50
Infant-Toddler Version
Store Price
Alison's
4 cylinders per block
\$68.25
Alison's
5 cylinders per block
\$81.90
Alison's
1-3 cylinders per block
\$48.00
Replacement Cylinders
Store Price
Alison's
1 smallest of each
\$10.50
5 of smallest from block 1
\$4.99
Nienhuis \$5.75
Stand for Cylinder Blocks
Store Price
Affordable Montessori \$119.00
Alison's
with spots for Knobless Cylinders
\$185.00
Bruins \$134.00
E & O \$53.10