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Most of these questions involve work on length and perimeter which we have not covered yet this year, but you did in Year 3. Just a reminder for you:
1cm = 10mm
1m = 100cm
To convert cm to mm you need to multiply by 10 eg 4 cm = 40mm
To convert mm to cm you need to divide by 10 eg 120mm = 12 cm
To convert m to cm you need to multply by 100 eg 3m = 300cm
To convert cm to m you need to divide by 100 eg 1000cm = 10 m
Perimeter is the distance all the way around the outside of a shape.