Answer
Multiples of 320 are:
320, 640, 960, 1280, 1600, 1920, 2240, 2560, 2880, 3200, 3520, 3840, 4160, 4480, 4800, 5120, 5440, 5760, 6080, 6400, 6720, 7040, 7360, 7680, 8000, 8320, 8640, 8960, 9280, 9600, 9920, 10240, 10560, 10880, 11200, 11520, 11840, 12160, 12480, 12800, 13120, 13440, 13760, 14080, 14400, 14720, 15040, 15360, 15680
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