0
30x40=?
Let's find out.
What's 3x4? 12.
Ok. So the 3 and 4 are out of the problem now.
Look back at the problem.
We see two zeros.
We already took care of the 3 and 4.
So what do we do with the zeros?
You add them on to the number you already have.
So 4x3=12. So it is 1,200.
30x40=1,200.
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