1. Tính nhẩm:

Gửi bởi: Phạm Thọ Thái Dương Vào 5 tháng 7 2019 lúc 13:02:31

\(27 \times 10 = \ldots \\ 86 \times 10 = \ldots \\ 358 \times 10 = \ldots \)

\(72 \times 10 = \ldots \\ 103 \times 10 = \ldots \\ 1977 \times 100 =\ldots \)

\(14 \times 1000 = \ldots \\ 452 \times 1000 = \ldots \\ 300 \times 1000 = \ldots \)

\(80:10 = \ldots \\ 300:10 = \ldots \\ 2000:10 = \ldots \)

\(400:100 = \ldots \\ 4000:100 = \ldots \\ 40000:100 = \ldots \)

\(6000:1000 = \ldots \\ 60000:1000 = \ldots \\ 600000:1000 = \ldots \)

\(64 \times 10 = \ldots \\ 640:10 = \ldots \)

\(32 \times 100 = \ldots \\ 3200:100 = \ldots \)

\(95 \times 1000 = \ldots \\ 95000:1000 = \ldots \)

\(27 \times 10 = 270; \\ 86 \times 10 =860; \\ 358 \times 10 = 3580; \)

\(72 \times 10 = 720; \\103 \times 10 = 10300; \\1977 \times 100 = 197700; \)

\(14 \times 1000 = 14000 \\ 452 \times 1000 = 452000 \\ 300 \times 1000 = 300000 \)

\(80:10 = 8; \\ 300:10 = 30; \\ 2000:10 = 200; \)

\(400:100 = 4 \\ 4000:100 = 40 \\ 40000:100 = 400 \)

\(6000:1000 = 6 \\ 60000:1000 = 60 \\ 600000:1000 = 600 \)

\(64 \times 10 = 640; \\ 640:10 = 64; \)

\(32 \times 100 = 3200; \\ 3200:100 = 32; \)

\(95 \times 1000 = 95000 \\ 95000:1000 = 95 \)