The teaching video takes you through the different steps the children will take as they build up to achieving the new objective. The video includes worked examples as well as questions for the children to have a go at and discuss with an adult. Use the video at the pace your child needs it and keep stopping and starting when you need too. Any work from the examples on the video can be done in the child's book. This should hopefully give your child the confidence to then complete the first questions on the independent work. The second sheet of the independent work is problem solving and reasoning so don't feel the pressure to push your child onto these unless you feel they secure with the main objective.
This lesson looks again at converting between measures. The fact children need to be secure with is that 1cm is 10mm. They will be converting between the two measurements so they need to understand that 3 cm 1 mm is the same as 31mm and that 31 mm is the same as 3cm 1m.