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**Objective:**

Child will be able to use SOHO Bricks as manipulatives to add and subtract vectors.

**Essential Question:**

How might we add and subtract vectors of varying directions?

**Special Materials:**

None

Bricks Required:

1×1 bricks of different colors

**Project Structure**

Engage/Explain:

- Provide child with 1×1 SOHO bricks in various colors.
- Ask child to construct several vectors of various magnitude and direction (“4 bricks to the right” “7 bricks to the left”).
- Ask child to solve several vector addition problems using their bricks to model the vector additions (it is a good idea to start with same-direction vectors and then proceed to opposite-direction vectors).
- Have child write brief explanations of how their vector addition prob

**Explore:**

- Provide more rigorous problems to child by giving them horizontal and vertical vector problems that can be modeled on graph paper.
- Ask child to develop a method for determining how to add these vectors together.
- Work with child on developing the parallelogram rule and using tip-to-tail methods of lining up vectors.
- Child should practice solving problems visually, as well as numerically.

**Explain/Elaborate**

- Provide child with problem sets to practice adding and subtracting a series of vector problems that can be solved numerically and with graphing.
- Child should also demonstrate graphically how vectors
*a*+*b*=*b*+*a*.