Florida B.E.S.T. MA.912.GR.2.1
The Standard
Given a preimage and image, describe the transformation and represent the transformation algebraically using coordinates.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students compare corresponding vertices to determine how a figure moved, turned, flipped, or changed size. They describe the transformation and write a coordinate rule such as (x, y) → (x + 4, y - 2).
What Mastery Looks Like
- Students correctly pair corresponding points and identify the transformation that maps every vertex. They write an accurate coordinate rule, including direction, distance, angle, line of reflection, or scale factor when needed.
Common Misconceptions
- Students may reverse the direction by mapping the image back to the preimage. They often swap rotation rules, miss negative signs, or describe a dilation without naming its scale factor and center.
How to Assess It
- Give A(1,1), B(3,1), C(1,2) and A′(-1,1), B′(-1,3), C′(-2,1). Ask students to name the transformation and write its coordinate rule.
Lesson moves
Ways to Teach It
Plot a polygon on grid paper, move it with tracing paper, and record how each coordinate changes.
Ask students to explain: “How can you prove one coordinate rule works for every vertex?”
Run a card sort matching coordinate pairs, transformation names, diagrams, and algebraic rules.
Place a simple logo on a coordinate grid, resize or reposition it, and write the rule used by the designer.
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Printable MA.912.GR.2.1 Worksheet
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Related Standards
- MA.912.GR.2.3
Identify a sequence of transformations that will map a given figure onto itself or onto another congruent or similar figure.
- MA.8.GR.2.1
Given a preimage and image generated by a single transformation, identify the transformation that describes the relationship.
- MA.8.GR.2.3
Describe and apply the effect of a single transformation on two-dimensional figures using coordinates and the coordinate plane.
- MA.8.GR.2.2
Given a preimage and image generated by a single dilation, identify the scale factor that describes the relationship.
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