Start the maths lesson by doing our usual board calculations. Remember to check your answers and do any corrections if you need to.

Can I convert units of length using cm and mm?

Key fact for this lesson is 1cm = 10mm

To convert cm to mm  multiply by 10    Example       9cm = 9x10  = 90mm

To convert mm to cm  divide by 10       Example        110mm = 110 ÷10  = 11cm

                                                                             67 mm = 6cm 7mm

Watch the White Rose video by clicking on the link below. 

There is a worksheet and some extra reasoning questions to try if you have time. Remember to check your work using the answers and do any corrections if you have them.