Year 1 Partitioning Partitioning numbers is a term used to describe the splitting up of numbers into parts so as to make them easier to work with. One of the main parts of this is to recognise 2-digit numbers as being made up of tens and units. For example 47 can be partitioned (or split) into 4 tens and 7 units or 40 and 7. This is really helpful when children are trying to calculate mentally (in their heads), so a sum such as 34 + 48 can be done by adding 30 + 4 + 40 + 8. Add the tens to make 70, then add the 8 to make 78 then add on the 4 to make 82. Partitioning numbers is taught in Key Stage 1 and we have just published our very latest sets of worksheets to help with this. Take a look in our Year 1 Ordering Numbers category.