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Introduction
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In this activity, we will be multiplying a two-digit number by a one-digit number.
To do this, we need to partition the two-digit number into its place value.
So, let's try multiplying 22 by 7.
The first step is to partition 22.
22 can be partitioned into 20 and 2.
The next step is to multiply the ones and tens by 7.
2 × 7 = 14
20 × 7 = 140
The final step is to add the products together.
140 + 14 = 154
So, 22 × 7 = 154
Let's try an example question together.
Example
Work out the missing number:
23 × 4 =
Answer
We are trying to work out 23 lots of 4.
23 can be partitioned into 20 and 3.
So we work out 20 lots of 4 and then 3 lots of 4.
20 × 4 = 80
3 × 4 = 12
Now add the products together.
80 + 12 = 92
So, 23 × 4 = 92
Now you've seen the method to use, it's your turn to try some questions.
Question
/ 10Mr Shepherd
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Teacher explanation