#### 1.3.1

choose and use appropriate metric units of length, their abbreviations, conversions between them, and appropriate levels of accuracy, such as mm for building and other trade contexts, cm for textiles

#### 1.3.3

convert between metric units of length and other length units for simple practical purposes, for example, 1 inch ≈ 2.54cm

#### 1.3.4

calculate perimeters of familiar shapes, including: triangles, squares, rectangles and composites of these