Block 2: Addition and Subtraction

Mental addition and subtraction of multiples of 100, including crossing over the thousands.

Work carefully, using patterns such as pairs of numbers that make 10, to help answer these.

A different slant on adding 4-digit numbers: comparing the answers to say which is greater.

Use the place value table to help add and subtract.

A tricky page on multiple exchanges when adding, suitable for those confident with written addition.

Using bar models to help with addition and subtraction word problems.

Rounding to the nearest hundred to find approximate answers.

Rounding to the nearest thousand to find approximate answers.

Today we are looking at the formal, written method of addition. We are going to add two 4-digit numbers. 5,678 plus 2,789.

Today we are going to use written methods to add decimals.

Using a place value chart and counters to show the written addition method with no exchange.

Using a place value chart and counters to show the written addition method with one exchange.

Using a place value chart and counters to show the written addition method with two exchanges.

Put the correct digits in to make the addition calculations correct.

Subtracting a single digit from a multiple of 1000. Then, moving on to subtracting two numbers just either side of the thousands boundary. They look tricky but are easy if you 'count on'.

Use bar models to help with subtraction.

Using bar models to help with word problems and subtraction. Children choose the most appropriate method, mental or written.

Written subtraction, exchanging the thousands and hundreds.

More written subtraction of 4-digit numbers.

Using squared paper to help with adding two 4-digit numbers.

Tricky subtraction: missing digits in standard written method of subtraction.