Max Maths, Year 5, Try it, Perimeter of shapes

In the 'Max Maths' workbook for Year 5, students are presented with exercises to calculate the perimeter of shapes, specifically focusing on squares and rectangles. The first task involves a square drawn by Toby which has a perimeter of 36 cm. To find the length of each side, students are instructed to divide the total perimeter by the number of sides in a square, which is four. The calculation is straightforward: the perimeter of 36 cm divided by 4 equals 9 cm. Therefore, each side of Toby's square measures 9 cm in length.

The second exercise presents a rectangle with a total perimeter of 210 m. The length of the rectangle is given as 75 m. To find the width, students must subtract the combined length of the two longer sides from the total perimeter and then divide the result by 2, as there are two widths in a rectangle. The calculation is set out as follows: (210 m − (2 × 75 m)) ÷ 2, which simplifies to (210 m − 150 m) ÷ 2. This results in 60 m ÷ 2, giving a width of 30 m. The third task asks students to calculate the perimeter of a square with a side length of 60 cm. Since a square has four equal sides, the perimeter is found by multiplying the side length by 4, which gives a total perimeter of 240 cm.