KS3 Maths Estimating Perimeter and Area

A series of interactive problems on estimating perimeters and areas of rectangles and triangles by rounding each length to the nearest integer.

Please note in the example I did between 3:12 and 5:30 I made an error. 7.6 rounds to 8 so the area should be 8 x 3 = 24 metres squared. And the perimeter should be 22 m.