Reach for the Star

Enlargement and scale factors · Optional extension

L030 · Allow 10–15 minutes for learners ready to move on. Answers are available after an attempt.

Stretch

Enlarge a rectangle 3 cm by 5 cm by factor 2.5. Find new area.

Reveal a worked check after attempting

New sides 7.5 and 12.5 cm; area=93.75 cm².

Deep challenge

An enlargement factor is −2 about the origin. Where does (3,−4) map, and what happens to orientation?

Reveal a worked check after attempting

(−6,8); it lies opposite the centre and lengths double.

Recall & Review: feedback and extension integration

Lesson L030: Enlargement and scale factors

Objective: Enlarge shapes from a stated centre, including positive fractional factors, and explain how centre and factor determine the image.

60-minute structure: 0-7 Connect & Check; 7-14 Share; 14-25 Present/model; 25-44 Apply route choice/practice; 44-52 independent exam-style check; 52-60 Recall & Review, WWW/EBI and next step.

What Went Well (WWW)

I selected the correct geometric fact, theorem, formula or transformation and used a clear diagram with appropriate labels and units.

Even Better If (EBI)

I will name the fact or theorem, show the substitution or construction step and check whether the size, direction and units of the result are reasonable.

Stretch and deep challenge

Stretch: Enlarge a rectangle 3 cm by 5 cm by factor 2.5. Find new area.

Deep challenge: An enlargement factor is −2 about the origin. Where does (3,−4) map, and what happens to orientation?