Posted by Peter on 2nd July 2010

# Ratio and proportion, counting back and calculator game

We sometimes take for granted that children can count without any problems. Unfortunately, this is often not the case. Next week we  publish the second page of revising counting back in whole tens from any 2-digit or 3-digit number, aimed at year 3 children. Some children still find this difficult, especially when it involves crossing a hundreds boundary and they will need as much practice as possible.

Ratio and proportion can also be quite a tricky subject for children to fully understand. If there are 6 yellow cubes and four blue cubes we can say that the ratio of yellow to blue is 6 to 4 or 6:4. This can be simplified to 3 to 2 or 3:2.

The proportion is usually written as a fraction of the whole lot, so the proportion of yellow cubes would be 6 out of 10, or when simplified, 3 out of 5. This can be written as a fraction 3/5. This is usually covered in year 5 and developed further in year 6.

The six times table is one of the hardest to learn, but we will be publishing another in our calculator games sequence which will help reinforce this table as a great revision exercise for year 4.