How to multiply easily two 3-digt numbers in your head, for example 234 x 890:
200 x 800 = 160,000 200 x 90 = 18,000 200...
How to multiply easily two 3-digt numbers in your head, for example 234 x 567:
200 x 500 = 100,000 200 x 60 = 12,000 200...
How to multiply easily two 3-digit numbers in your head, for example 234 x 234:
200 x 200 = 40,000 200 x 30 = 6,000 200...
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