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Math - Memory Work
LevelPrimary
Age4 - 5
PrerequisitesNumber Rods With Numerals
MaterialsNumber Rods
numeral cards 1-10
2 "+" signs
2 "=" signs

This activity introduces the child to simple addition facts.

## Presentation

1. Bring the material to the mat. Grade the rods.
2. Place the 1 rod and the 2 rod end to end. Ask the child to find one rod that is as long as the two put together.
3. Place the 3 rod below to compare. "This rod and this rod put together are the same as this rod."
4. "Here's another way we can say it:" place the symbols as shown.
5. Count the rods and place the appropriate number cards. "One plus two is the same as three."
6. Scoot the number cards down and add the second set of symbols. "One plus two equals three."

## Aims

Direct Aim:

1. To show how we get larger numbers from smaller ones.

Indirect Aim:

1. To show the limits of base 10.
2. Inquiry into the concept of one half.

## Control of Error

• The ten rod.
• The visual shape of the layout.

## Material

Prices and links checked: 23 January 2022

Number Rods
Store Price
Affordable Montessori \$70.00
Alison's
with number cards
\$49.61
Bruins \$180.00
E & O \$102.60
IFIT \$60.00
Materials Co. of Boston \$125.00
Montessori Concepts \$78.00
Montessori Outlet \$63.95
Nienhuis \$188.80
Thinkamajigs \$72.95
Stand
Store Price
Affordable Montessori \$42.00
Alison's \$32.41
Alison's \$52.50
Bruins \$60.00
IFIT \$30.00
Material Co. of Boston \$49.00
Montessori Concepts \$34.00
Montessori Outlet \$35.95
Pink Montessori \$26.90
Thinkamajigs \$42.95
Number Cards
Store Price
Affordable Montessori \$13.00
Alison's \$10.00
Alison's \$24.00
Alison's \$18.00
Bruins \$27.00
E & O \$19.80
Hello Wood \$33.00
IFIT \$11.00
Materials Co. of Boston \$10.00
Montessori Concepts \$19.00
Montessori Outlet \$5.95
Montessori Outlet \$5.95
Montessori Outlet
box
\$5.95
Nienhuis \$13.20
Nienhuis
box
\$18.15
Pink Montessori \$12.50
Thinkamajigs \$13.95
Table-top Number Rods (2 sets of little rods)
Store Price
Affordable Montessori \$29.00
Alison's \$80.00
Alison's \$30.87
Bruins \$110.00
E & O \$46.80
IFIT \$28.00