Montessori Addition Strip Board teaches preschoolers and kindergartners the mathematical concept of adding numerals one through nine more abstractly using blue and red strips.
A traditional Montessori material, the Addition Strip Board, introduces a child to adding numbers slightly more abstractly. This material should be presented to a child who has a very strong understanding of quantity to a numeral concept because here there is no tangible quantity like spindles (buy here) or golden beads (buy here) from Teens Board (buy here) in the previous lessons. Still, this is a great way to introduce a child to the concept of combining numbers to make new numbers.
What is the Montessori Addition Strip Board
Montessori Addition Strip Board is a wooden board with 12 squares by 18 squares and with the numerals 1-18 printed across the top. It comes in a wooden box containing 9 red wooden strips and 9 blue strips of varying lengths, both printed with the numerals 1 to 9.
How to set up the Addition Strip Board:
Blue control rods without the lines should be positioned to the left of the board, and the red rods that you will be adding (addends) to the right. (I know it is counterintuitive.) In this lesson, we are using equations. You can use wooden numerals (similar here), or you can write equations on paper and cut them out (lamination is optional).
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Can a 3-year-old learn addition? Yes, with a Montessori Strip Board
Addition Strip Board prepares a child for abstract mathematics by offering concrete experience in addition to numerals and aiding in learning addition tables. Most importantly, this lesson exposes a child to the world of numbers, which is very exciting and intriguing, so to keep the interest alive, stop the lesson before the child’s interest starts to wane.
Usually, you will do three equations at a time, but if the child wants to do just one, it is totally fine: merely return to this material at a later point – solve as many equations as the child shows interest in.
Presentation of this Montessori Math Lesson:
For example, the equation 6+4 =10. First, the child will line the blue six-rod under the red top numbers. Then, the child would find the red four rod and place it right next to the blue one. Besides, you can reinforce the resulting sum by counting squares underneath and/or confirming the sum by pointing to the number above. Once the equation is solved, a child should place the rods back to the sides of the board before proceeding to the next equation.
Setting Up the Montessori Strip Board
It is very important to have this material set up in an orderly to ensure success and prevent frustration. When the inner need that compelled the child to perform this activity has been satisfied, the material should be put back into the box. The best way to put this back is to start with the longest rod because there is only one way it will fit back in the box. Lastly, place the material back on the shelf.
Writing Down Equations
DIY Note: Addition strips can be easily made by cutting red and blue strips of heavy cardstock.
After solving this equation, Adrian wrote it down on his worksheet. You can also emphasize that the sum equation has a commutative property, meaning that changing the order of the operands does not change the result [6+4=4+6]. See the above video’s post here, where I also linked a free download of the Math Addition worksheet Adrian is writing on.
For more on addition, see a post here, “Montessori Math Simple Addition using Marble-Counters,” which also introduces ‘What is Montessori Math?‘ Also, see here an Extension to the Strip Board: “Addition Strip Board Making 10’s.”
Recycled Dot Stickers DIY Making 10 s
Do you have leftover sheets from dot stickers? Well, put them to use with this super easy DIY-making 10s activity. Cut a rectangle of ten used-up stickers (it is two rows of five), peel off the back, and adhere to a white paper. Now, ask your child to fill the ten-dot rectangle with different combinations of two colors of stickers, making ten.
We are also using a traditional Montessori Addition Strip Board to reinforce the understanding of addends~ any of the numbers that are added together ~making a sum of ten. I also introduced the term “commutative,” ~ meaning that the addends can “commute” ~ travel switching sides, and the sum will not change.
Please emphasize that commutative property ~ in mathematics, a binary operation is commutative if changing the order of the operands does not change the result ~ applies to addition and not subtraction. We are also referring to 1 2 3 Count with Me (Trace-and-Flip Fun!), which an amazing book to teach your child proper number tracing!
For more on math, see here a post video “Beginning Subtraction.”
See links to previous math lessons here.
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