Review column addition and identify the addends and sum

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

The sum is the total when numbers are added together.

Review and use knowledge of place value to correctly lay out column addition

Review adding 2-digit numbers using column addition without regrouping

Review adding 3-digit numbers using column addition without regrouping

Use column addition to solve problems in different contexts

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 ones 

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

Review using column addition with regrouping in the ones and tens columns

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.

Review using known facts and strategies to accurately and efficiently use and check column addition

Use knowledge of column addition to solve problems in a range of contexts

The minuend is the number being subtracted from.

A subtrahend is a number subtracted from another.

The difference is the result after subtracting one number from another.

Review identifying the minuend and subtrahend in column subtraction

Column subtraction is a way of subtracting numbers by writing a number below another.

Review using column subtraction to subtract without regrouping

Review using column subtraction with regrouping from tens to ones

Review using column subtraction with regrouping from hundreds to tens

A mental strategy is a method chosen to find something out which can be done in your head or with some jottings.

Review of column addition and subtraction

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Some of these lessons will soon be taken down.