How do i convert measurements

How do i convert mm3-cm3-m3
mm2-cm2-m2 and how do i convert mm/cm/m3 into litres?
thank you and please dont use symbols apart from 'x'

There are too many combinations to cover them all, so here is the principle and some examples.

It' easier/neater to use standard form (scientific notation) but in case you don't know this, I've used normal numbers.
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mm²-cm²-m²

Imagine a square 1m x 1m. area = 1m²
This is the same as a square 100cm x 100cm, area = 10,000cm²
This is the same as a square 1000mm x 1000mm, area = 1,000,000mm²

Therefore: 1m² = 10,000cm² = 1,000,000mm²

E.g Convert 2m² to mm²
Multiply by 1,000,000
2m² = 2,000,000mm²

E.g. convert 1200mm² to m²
Divide by 1,000,000
1200mm² = 1200/1,000,000 = 0.0012m²
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mm³-cm³-m³

These are done in the same way

Imagine a cube 1m x 1m x 1m. volume = 1m³
This is the same as a cube 100cm x 100cm x 100cm, volume = 1,000,000cm3³
This is the same as a cube 1000mm x 1000mm, volume = 1,000,000,000mm³

Therefore 1m³ = 1,000,000cm³ = 1,000,000,000mm³

Then use the same method as for area

Note, 1ml (1 millilitre) is the same as 1cm³.

How do i convert mm3-cm3-m3
The design of the metric system makes this very easy.
1 m = 100cm = 1000mm
1 cm = 10mm
1 m^2 = 100^2 cm^2 = 10^4 cm^2
1 m^2 = 1000^2 mm^2 = 10^6 mm^2
1 cm^2 = 10^2mm^2 = 100mm^2
1 m^3 = 100^3 cm^3 = 10^6 cm^3
1 m^3 = 1000^3 mm^3 = 10^9 mm^3
1 cm^3 = 10^3mm^3 = 1000mm^3
1 m^3 = 1000 litres
1 litre = 1000 millilitres = 1000 cm^3 = 1000*10^3mm^3 = 10^6 mm^3

Well you can go online at type in mathsconverter.com