Useful Conversion Tables 

1 sq metre   = 1.2 sq yds
2 sq metres = 2.4 sq yds
3 sq metres = 3.6 sq yds
4 sq metres = 4.8 sq yds
5 sq metres = 6.0 sq yds
6 sq metres = 7.2 sq yds
7 sq metres = 8.4 sq yds
8 sq metres = 9.6 sq yds
9 sq metres = 10.76 sq yds
10 sq metres= 12 sq yds.

1 sq yd   = 0.8 sq metre
2 sq yds = 1.7 sq metres
3 sq yds = 2.5 sq metres
4 sq yds = 3.35sq metres
5 sq yds = 4.2 sq metres
6 sq yds = 5.0 sq metres
7 sq yds = 5.85sq metres
8 sq yds = 6.7  sq metres
9 sq yds = 7.52sq metres
10 sq yds= 8.4 sq metres

1cm  =  0.39in
2cm  =  0.79in
3cm  =  1.18in
4cm  =  1.58in
5cm  =  1.97in
6cm  =  2.36in
7cm  =  2.76in
8cm  =  3.15in
9cm  =  3.54in
10cm =  3.94in
15cm =  5.91in
20cm =  7.87in
30cm =  11.81in
45cm =  17.72in

Inches to  centimetres

1in  = 2.54cm
2in  = 5.08cm
3in  = 7.62cm
4in  = 10.16cm
5in  = 12.7cm
6in  = 15.24cm
7in  = 17.78cm
8in  = 20.32cm
9in  = 22.86cm
10in = 25.4 cm
11in  = 27.94cm
12in  = 30.48cm
18in  = 45.72cm