Year 3 Maths 11.1.21

11.1.21 LO: Multiply two digits by one digit Partition the two digit number into tens and ones Multiply the ones by the one digit number Multiply the tens by the one digit number Recombine the two totals to find the answer

Starter

Recap on partitioning Partitioning means breaking up numbers in a different way so that they are easier to work with.

The easiest way to partition a number is to split it into it’s tens, ones. This isn’t the only way we can partition though.

14

23

Example: 10

4

46

Recap on partitioning Partitioning means breaking up numbers in a different way so that they are easier to work with.

The easiest way to partition a number is to split it into it’s tens, ones. This isn’t the only way we can partition though.

14

46

23

Example: 10

4

20

3

40

6

How would you answer this?

2 x 23

Can you use partitioning to help you?

2 x 23 = 46

3 x 23 =

3 x 23 = 69

69

3 x 20 = 60

3x3=9

60 + 9 = 69

11.1.21 LO: Multiply two digits by one digit Partition the two digit number into tens and ones Multiply the ones by the one digit number Multiply the tens by the one digit number Recombine the two totals to find the answer

Work 1 1.

2.

3.

2 x 1= 2 x 30 = 2 x 31 =

4.

2x4= 2 x 40 = 2 x 44 =

6.

3x3= 3 x 30 = 3 x 33 =

Work 2 1 a)

b)

3x3= 3 x 30 = 3 x 33 =

21 x 3 =

2.

3.

Work 3 Calculate: 3 x 13 5 x 11 4 x 12 2 x 34 2 x 45

8 x 11

3 x 22 3 x 33

2.

3.

Work 4 – Multiplying one digit by one digit (5 x tables)

Use the number line to help you!

Work 1 ANSWERS

2 60 62

4.

2x4=

8

2 x 40 =

80

2 x 44 =

6.

3x3=

9

3 x 30 =

90

3 x 33 =

99

88

Work 2 ANSWERS 1 a)

b)

21 x 3 =

3x3=

9

3 x 30 =

90

3 x 33 =

99

63

Work 3 Answers Calculate: 3 x 13 = 39 5 x 11 = 55 4 x 12 = 48 2 x 34 = 68 2 x 45 = 90 8 x 11 = 88 3 x 22 = 66 3 x 33 = 69

2.

3.

Work 4 ANSWERS