Maths home learning 25.3.20

Parent note: the aim of this session and the next couple of sessions is to help develop children’s understanding and knowledge of different strategies for multiplication, to help their efficiency at solving multiplication sums. As a year group, we have already covered a range of strategies. These sessions will help secure these. Alternatively, if you would like to supplement this activity, please allow your child to play Times Tables Rockstars and/or play interactive multiplication and division games on TopMarks.

Partitioning 2 digit numbers into tens and ones is an efficient way to simplify multiplying 2 digit numbers by 1 digit numbers.

For example, 25 x 8:

25

20 x 8 = 1605 x 8 = 40160 + 40 = 20025 x 8 = 200

When using partitioning as an efficient method for multiplying 2 digit numbers by 1 digit numbers, there are 4 steps you must take. Step 1: Partition the 2 digit number into tens and ones (example: 25 = 20 and 5) Step 2: Multiply the tens by the number you are multiplying by (example: 20 x 8) Step 3: Multiply the ones by the number you are multiplying by (example: 5 x 8)Step 4: Add the product (answers) of both sums together (example: 100 + 40). The product of both answers added together, is your final answer to the multiplication sum (example: 100 + 40 = 140. 140 is the product of 25 x 8).

20 5

Activity: Use the partitioning method to solve these 2-digit by 1-digit multiplication sums.

The first one has been done for you, as an example to show you further how it is used. In your workbook, lay out your learning in a similar format to show your understanding.

1) 34 x 334 partitioned into tens and ones = 30 and 4. 30 x 3 = 90 4 x 3 = 1290 + 12 = 10234 x 3 = 102

2) 23 x 4 3) 52 x 5 4) 62 x 65) 81 x 7

Extension: Challenge yourself!