The Subtraction Strip Board is used:
- To help the child concentrate on the basic subtractions, leading to memorization.
- To help a child practice and begin to memorize subtraction facts.
- To solve subtraction equations (minuend up to 18).
- To use the visual, auditory and stereognostic senses in the exercises for addition memorization.
- To memorize facts for subtraction.
- To understand the relationship between addition and subtraction.
- To prepare the mind for negative numbers.
- To make abstract calculation possible.
- To build the consciousness of building to 10 and then adding more.
This resource includes:
- Subtraction Strip Board
- 1 set of blue and 1 set of red strips (1-9)
- 1 set of neutral strips (1-17)
Here you can print your own and go! Save yourself hours of work and lots of money.
This material is suitable for any child – whether in a traditional Montessori environment or not.
Please reach out if you have any questions. I love to receive feedback and always respond when I get some!
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ▯ – 3, 6 + 6 = ▯.
Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
Fluently add and subtract within 5.
For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.
Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.