Dilations by a Scale Factor about the Origin
PrintPrint this handout, clean, at stepsies.com.
Grade 7 Math · Teaching handout
Dilations by a Scale Factor about the Origin
Teaches dilating a shape about the origin by a scale factor from 1/4 to 4: multiply each coordinate by the factor to find the image's vertices, then draw it.
Print handout
Your first print is free, with no sign-in. Then 10 sheets a month with a free account. Prints on Letter paper, or print on A4.
Print the answer key for Try it together
- Skill
- Dilations Worksheets
- Grades
- Grade 7
- Pages
- 1
- Time
- About 15 minutes
- Answer key
- Included, for Try it together
- Printing
- Tinted accents, also fine in black and white
What is on a handout
- The big idea: the rule, in a few short sentences.
- Watch me: worked examples, each with why it changes as it does.
- Watch out: the mistakes children often make, struck through beside the right answer.
- Try it together: a few items or problems to do as a class, with an answer key.
- On your own: the practice sheet that comes next.
How to teach with it
- Have children draw a line from the origin through each vertex. The image's vertex lands on the same line, nearer the origin for a factor under 1 and further out for one over 1. Watch for adding the factor: (2, 1) by 3 is (6, 3), not (5, 4).
- Read the big idea aloud, then work through Watch me together, saying why each one changes.
- Ask the class to find the mistake in each Watch out before you show the answer.
- Do Try it together as a class, check it with the answer key, then hand out the practice sheet.
Practice worksheets
After the handout, in this order: the main practice sheet first, then more practice, then quick checks.
