Breaking arrays and perimeter
Answers are for parents and teachers.
1
Break 8 × 7 in two different ways and check that both give 56.
For example (8 × 5) + (8 × 2) = 40 + 16 = 56 and (8 × 4) + (8 × 3) = 32 + 24 = 56.
2
A rectangular garden is 12 m long and 5 m wide. How long is the fence all the way round it?
12 + 5 + 12 + 5 = 34 m.
3
Name three polygons you can find at home and say how many sides each one has.
Any correct answers, for example a door (rectangle, 4 sides), a tile (square, 4 sides) and a road sign (triangle, 3 sides).
4
A hexagon has 6 sides of 8 cm each. What is its perimeter?
6 × 8 = 48 cm.
5
This octagon has 8 equal sides. What is its perimeter?
8 × 2 = 16 cm.