Being efficient means finding a way to solve a problem quickly whilst also maintaining accuracy.

Estimation means to find a value that is close enough to the right answer, usually with some thought or calculation involved.

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

Use known facts and strategies to accurately and efficiently calculate and check column addition

Maths

In this unit pupils will identify the addends and the sum in column addition. They will use their knowledge of place value to correctly lay out column addition. In the future unit pupils will identify the minuend and the subtrahend in column subtraction and explain the column subtraction algorithm. They will subtract from a 2-digit number using column subtraction with exchanging.

In the prior unit pupils accurately and efficiently solved multi-step addition and subtraction problems. They understood and explained how both addition and subtraction equations could be used to describe the same additive relationship. In this unit pupils will identify the addends and the sum in column addition. They will use their knowledge of place value to correctly lay out column addition.

Column addition

What is the missing tens digit in the second addend in the column addition? 

What could the missing digits be in the column addition? 

What would be a good estimate for the sum of 298 + 305? 

Which of these calculations would it be more efficient to calculate mentally?

Which calculations would give an answer between 700 and 800? 

Where will regrouping be needed in this column addition? 

Jun has started this column addition. Complete it to find the sum.

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