Lesson One hundred and seven: Column Multiplication
Inspect this multiplication problem:
24
x 2
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The top number in this problem now has two digits. In this example the
answer will also have two digits:
24
x 2
-----
48
The top digits are each multiplied by the bottom number. In this example,
the product of 4 x 2 goes in the ones column and the product of 2 x 2 goes
in the tens column.