Review adding 3-digit numbers using column addition without regrouping

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

Which expression is represented by the Base 10 blocks? 

What is the missing sum in the 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 a 3-digit and a 2-digit number. What is the largest sum you can make?

What is the sum in this column addition?  

What ones digit is missing from this column addition?

Which two addends would make this column addition correct?

Which addend would make this column addition correct?

Use the digit cards. Set them out to make two 2-digit numbers. What is the largest sum you can make?

This lesson will soon be taken down.

Review adding 3-digit numbers using column addition without regrouping

Lesson outcome