Learn to multiply a one-digit number and a two-digit number. For
example, 4 X 12 can be written as (4 X 10) + (4 X 2). Look at the example below.
4 X 10
4 X 2
The table above shows 4 groups of 10 and 4 groups of 2.
You can solve the problem 4 X 12 by writing the problem as;
4 X 12 = (4 X 10) + (4 X 2) = 40 + 8 = 48
You can also write the problem vertically. Look below.
1
2
4
When you multiply vertically you start with the ones column and move to the tens
column.
Multiply 4 times 2 first. 4 X 2 = 8
1
2
4
8
Multiply 4 times the 1 ten. 4 X 10 = 40
1
2
4
4
8
Look at the problem 6 X 14.
6 X 14 = (6 X 10) + (6 X 4) = 60 + 24 = 84
Or vertically
1
4
6
Multiply the ones column first. 6 X 4 = 24
1
4
6
2
4
Next multiply the tens column. 6 X 10 = 60
Then add 24 + 60 = 84
1
4
6
2
4
6
0
8
4
Complete the problems below.
1
1
5
1
3
2
1
1
6
3
2
3
4
4
2
2
1
4
1
3
5
1
0
6
5
1
4
7
8
7
9
8
1
5
6
0
0
1
9
3
2
7
1
5
3
1
2
8
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