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Holy Trinity C of E Primary School

Rooted in faith, we reach for the stars.

# w.c. 10.1.22

This week's learning about written multiplication methods benefits from quite a lot of practice so we have split each part of the learning over two sessions.

Lesson 1 and 2 - multiplication of 4 digit numbers by a 1-digit number

Please watch the video below to introduce a method for written multiplication.

## Multiply 4-digits by 1-digit

Your child may prefer to use the expanded method which we have taught as well as the concise method for 3 and 2-digit numbers.  Please see below for an example:

1375

x    3

15 (3 x 5)

210 (3 x 70)

900 (3 x 300)

3000 (3 x 1000)

4125

1

This involves multiplying each part of the number separately by 3 then adding the columns to find the total.  It takes longer but is easier than the concise method as you are holding less information in your head and not having to multiply and then carry/exchange in the same step.

Please choose some 4-digit numbers and multiply them by a 1-digit number to practise the written method.  Then have a go at using written multiplication to solve the problems on the PPT.  There are also some extension problems in the pdf document.  It is worth practising this over two days to ensure the method is fully embedded.

If you require a further investigation for the second session, please email Miss Cottrell using the HTP5S@welearn365.com email address.

Lesson 3 and 4 - multiplying 2-digits by 2-digits using the grid method

The grid method uses partitioning to help multiply a pair of 2-digit numbers.   Please watch the video below to introduce the method.

## Multiply 2-digits by 2-digits

Now have a go at working through the PPT which has some worked examples of the grid method.

Here are some more problems to try - one sheet has the number put in to the grid for you, on the other you do it yourself (the problems are the same on both!).  You might then like to try the extension problems.  As above, the best way to learn this method is through repeated practice - you could choose your own 2-digit numbers to multiply (think about a real-life context word problem they might fit into).

Lesson 5

Through your multiplication this week, you will have identified some times tables which you are less confident with.  Please practise these using TT rockstars or other games.  If you would like this week's maths homework emailed, please contact your class teacher using the class email address.
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