Enlarging shapes

Enlarging shapes

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Working with Students
Further Resources
This task is about enlarging shapes on a grid.
 
a)
Enlarge this shape to make each side three times its length.
 
 
b) 
Enlarge this shape to make each line two times its length.
 
 
c)
How many times has shape A been enlarged to make shape B? ______
 
Task administration: 
This task is completed with pencil and paper only.
Level:
3
Curriculum info: 
Maths, Geometry and Measurement, Transformation
Keywords: 
enlargement, scale factor
Description of task: 
Students enlarge shapes by specified increases in each dimension.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Geometric thinking, sets 3-4
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
 

Y7 (04/1998)
a)

 

b)

moderate

 

easy
c) 4 easy
Diagnostic and formative information: 
  Common errors Likely reason
a)
b)		 Adds 3 to each length.
Adds 2 to each length.		 Adds on scale factor rather than multiply by it.
c) 3 Adds on scale factor rather than multiply by it.