630 - 9 x 70, 210 - 7 x 30, 300 - 15 x 20, 600 - 30 x 20, 480 - 60 x 8, 360 - 40 x 9, 150 - 25 x 6, 270 - 90 x 3, 1000 - 20 x 50, 72 - 18 x 4, 175 - 35 x 5, 3600 - 60 x 60, 420 - 70 x 6, 6400 - 80 x 80, 875 - 35 x 25,

multiplication challenge

by Anonymous

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