Year 3
Using arrays to multiply a 2 digit number by a 1 digit number
Year 3
Using arrays to multiply a 2 digit number by a 1 digit number
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Lesson details
Key learning points
- In this lesson, we will learn to multiply 2 digit numbers by 1 digit numbers using arrays. We will construct suitable arrays to represent a number, and partition them to make a multiplication calculation clearer.
Licence
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5 Questions
Q1.
What does the word 'derive' mean?
Divide
Use the inverse
Q2.
Which of the following are strategies for deriving facts?
Doubling
Halving
Multiplication and division are inverse operations
Multiplication is commutative
Place value
Q3.
Which fact can be derived from 2 x 4 = 8
4 x 5 = 20
4 x 8 = 2
Q4.
What fact can be derived from 6 divided by 2 is equal to 3?
2 + 3 = 5
6 multiplied by 2 is equal to 3
Q5.
Which fact can be derived from 4 x 6 = 24?
2 + 6 = 8
40 x 2 = 80
6 Questions
Q1.
Which is an example of partitioning?
10 divided by 2
6 x 3
Q2.
Partitioning makes multiplying two digit numbers easier.
False
Q3.
13 x 5 =
45
55
Q4.
17 x 3 =
121
24
Q5.
18 x 4 =
76
84
Q6.
Use what you know about place value to work out 180 x 4 =
760
840