Eight shapes with every side labelled in centimetres, for Year 3 pupils to add up. Page 1 has three rectangles, two squares, two triangles and a pentagon, with an answer box under each. Page 2 asks which three shapes have a perimeter of 20 cm and which shape has the longest perimeter. Page 3 is the answer key, with every sum written out. It follows England National Curriculum measurement for Year 3.
Measurement
“measure the perimeter of simple 2-D shapes”
Questions 1 to 8 give a rectangle, a square, a triangle or a pentagon with every side labelled, and pupils find the distance round each one.
Measurement
“measure, compare, add and subtract: lengths (m/cm/mm)”
Question 9 finds the three perimeters that equal 20 cm, and question 10 finds the greatest, the 28 cm square.
Eight numbered shapes, each with all its sides labelled: rectangles of 6 by 4, 9 by 2 and 10 by 3, squares with sides of 5 cm and 7 cm, triangles of 3, 4, 5 and 6, 6, 6, and a pentagon with 4 cm sides. Pupils write each perimeter in the box below it.
Question 9 asks which three shapes have a perimeter of 20 cm. Question 10 asks for the shape with the longest perimeter, named and with its perimeter.
Each perimeter is shown as an addition, such as 9 + 2 + 9 + 2 = 22 cm. Questions 9 and 10 name the shapes by their numbers.
Teaching repeated sides
Point at shapes 2, 5, 6 and 8, where every side matches, and ask what shortcut pupils could use. Some will see multiplication, others will keep adding.
Mixed-ability groups
Pupils who find adding four numbers hard can start with shapes 1, 2 and 3. Others can go straight to questions 9 and 10.
Homework
Send page 1 home as a short task. Open the next lesson with question 9 to see who noticed that three different shapes share one perimeter.
Get started today
