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

Use column addition to solve problems in different contexts

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

What is the missing sum in the column addition?

What is the missing addend in this column addition? 

Alex scores 263 points and 316 points in a game. Which column addition has he written correctly to work out his total number of points?

Three children each play a computer game twice. They add their two scores together to get a total. Work out who scored the highest number of points. 

What is the missing sum in this column addition? 

What tens digit is missing from this column addition?

What hundreds digit is missing from this column addition?

Use the digit cards. Set them out to make two 2-digit numbers. (Only use each digit card once.)
What is the smallest sum you can make? 

Use the digit cards. Set them out to make a 3-digit and a 2-digit number. (Only use each digit card once.)
What is the closest number to 300 you can make?

This lesson will soon be taken down.

Use column addition to solve problems in different contexts

Lesson outcome