Add (giving answer in metre) :

 $0.93$$\mathrm{m}$ and $64 \mathrm{cm}$

Subtract (giving answer in metre) :

 $5.03 \mathrm{m}$ from $19.6 \mathrm{m}$

 Subtract (giving answer in metre) :

$428 \mathrm{cm}$ from $1033 \mathrm{m}$

Subtract (giving answer in metre) :

 $0.84 \mathrm{m}$from $122 \mathrm{cm}$

Add, giving answer in kg;

$2.06 \mathrm{kg}$and $57.864 \mathrm{kg}$

Add, giving answer in kg

$778 \mathrm{gm}$and $1.939 \mathrm{kg}$

Add, giving answer in kg

$0.065kg and 4023gm$

Subtract, giving answer in kg;

$9.462 \mathrm{kg}$from $\mathrm{from} 15.6 \mathrm{kg}$

Subtract giving answer in kg

$4317g , 23kg$