Rhododendron Walk, Ascot, Berkshire, SL5 8PN

01344 882631

Ascot Heath Primary School

“Confident learners in a happy, safe and secure environment”



Introducing adding using tens and ones

The diagram below demonstrates how the children place the numbers on the ‘adding house’ (e.g. 11  + 20). The children place the tens and ones in the correct columns,  red column for ones and yellow column for tens. They then add the ones first and then the tens, as you would do for column addition.

The first stage is to ensure that the numbers we use do not exceed 9 in either the ones or tens column  (e.g 12 + 23 =).  This will help the children to have a good understanding of addition before moving onto the next stage 'bridging through ten ( e.g: 17 + 25 =).


Teaching adding when you bridge through ten.


The children would place the two numbers on the 'adding house' as they did before.  They should then add the ones up first.  They know that you can not have more than 9 in the tens and ones columns.  Therefore if they count 11 ones they should place the 1 one in the ones answer box and write the 1 ten underneath the tens answer box ready to include when adding up how many tens they have. Next they should add up how many tens they have altogether, remembering not to forget the tens they have written underneath.