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This is a simple trick for multiplying
Let say:
39x45
39x4=156
39x5=195
156
195
_____
1755
Now how about three digit by three digit:
362x284
362x2=724
362x8=2896
362x4=1448
724
2896
1448
_________
102808
If the multiplication of the first number and the first digit of the second number is a three digit product then most likely the answer is a 5-digit answer
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