Column addition is a way of adding numbers by writing a number below another.

The process of unitising and exchanging between place values is known as regrouping.

Review using column addition to add 2- and 3-digit numbers by regrouping tens

Maths

In this unit pupils will revisit column addition with regrouping and column subtraction with exchanging to solve problems. They will read Roman numerals to 100. In the future unit pupils will consolidate column addition with regrouping and column subtraction with exchanging to solve problems. They will use known facts and strategies to accurately and efficiently calculate and check.

In the prior unit pupils identified the minuend and the subtrahend in column subtraction and explained the column subtraction algorithm. They subtracted from a 2-digit number using column subtraction with exchanging. In this unit pupils will revisit column addition with regrouping and column subtraction with exchanging to solve problems. They will read Roman numerals to 100.

Review of column addition and subtraction

 In which column addition calculations do you need to regroup in the tens?  

Which tens digit is missing from this column addition? 

Match up the 2-digit numbers so that each pair has a sum of 125

What is the sum in this column addition?  

In which column addition calculations do you need to regroup in the ones?  

Which ones digit is missing from this column addition? 

This lesson will soon be taken down.

Review using column addition to add 2- and 3-digit numbers by regrouping tens

Lesson outcome