Activity designed for students to practice identifying similar triangles, and find the scale factor between them. Print out the page of triangles and page of scale factor arrows for students (one between two works well). Match together the similar triangles. Find the scale factor between the two triangles using the arrows. Use this information to complete the missing angles and sides. Answers provided on last page

This lesson has been designed for students to be able to work independently on identifying upper and lower bounds, and using them in calculations. The questions posed should be sufficient for students to have little teacher input, but instead students should work through the questions, working collaboratively with one another, and checking answers as they progress. Lesson flow chart to display and/or print off so that students can work through at their own pace. Starter Activity: Recap of rounding to decimal places & significant figures Questions 1-3: Introduction to bounds Task A: Identifying upper and lower bounds Task B: Further practice identifying upper and lower bounds (if required) Questions 4-7: Calculating with upper and lower bounds (addition and multiplication) Introduction to division calculations Task C: Exam style questions