Addition by Partitioning

Worked Examples of Addition by Partitioning

Click here to return to Mental Arithmetic homepage.

In Years 3/4 children start to lay out numbers to be added vertically, to get ready for the introduction of column addition typically in Years 5/6.
When two-digit numbers are to be added, children are usually taught to add the tens first which gives a rough answer, and then add the units and add those to the total of the tens.
For three-digit numbers, the hundreds are added first, then the tens, and then the units.

Vertical Addition by Partition with 2-digit Numbers   69 + 54  110  (60 + 50) Add the tens   13  (9 + 4)   Add the units  123 Vertical Addition by Partition with 3-digit Numbers   125 + 845   900  (100 + 800) Add the hundreds    60  (20 + 40)  Add the tens    10  (5 + 5)    Add the units   970

Press F5 or click here to see more examples of addition by partitioning.



All worksheets published online at Mental-Arithmetic.co.uk are free to print without modification
for non-commercial use by schools, children, parents, and care givers.
© 2010-2018 Mental-Arithmetic.co.uk - All Rights Reserved