5. Ko‘paytiring. a) 64 × 10, 64 × 100, 64 × 1000; b) 512 × 10, 512 × 100, 512 × 1000; c) 4060 × 10, 4060 × 100, 4060 × 1000.

10 ga ko‘paytirganda son oxiriga bitta, 100 ga ko‘paytirganda ikkita, 1000 ga ko‘paytirganda uchta nol qo‘shiladi (son oxirida nollar bo‘lmasa).