Sometimes 1st graders can have the greatest difficulty understanding the concept of place value. If you’re not sure they really ‘get it,’ try this ‘Tens and Ones Addition’ worksheet. All he needs to do is count the groups of ten apples and the groups of single apples and write the answers in the space provided. Easy and simple yet it helps lock in the concept of place value in little minds. And when he’s done with this one, get him started on the next worksheet in this series.Tens and Ones Grouping.