Nhân với 10, 100, 1000,...Chia cho 10, 100, 1000,...
1. Tính nhẩm:
a)
\(27 \times 10 = \ldots \\ 86 \times 10 = \ldots \\ 358 \times 10 = \ldots \) | \(72 \times 10 = \ldots \\ 103 \times 10 = \ldots \\ 1977 \times 100 =\ldots \) | \(14 \times 1000 = \ldots \\ 452 \times 1000 = \ldots \\ 300 \times 1000 = \ldots \) |
b)
\(80:10 = \ldots \\ 300:10 = \ldots \\ 2000:10 = \ldots \) |
\(400:100 = \ldots \\ 4000:100 = \ldots \\ 40000:100 = \ldots \) |
\(6000:1000 = \ldots \\ 60000:1000 = \ldots \\ 600000:1000 = \ldots \) |
c)
\(64 \times 10 = \ldots \\ 640:10 = \ldots \) |
\(32 \times 100 = \ldots \\ 3200:100 = \ldots \) |
\(95 \times 1000 = \ldots \\ 95000:1000 = \ldots \) |
Hướng dẫn giải
a)
\(27 \times 10 = 270; \\ 86 \times 10 =860; \\ 358 \times 10 = 3580; \) |
\(72 \times 10 = 720; \\103 \times 10 = 10300; \\1977 \times 100 = 197700; \) |
\(14 \times 1000 = 14000 \\ 452 \times 1000 = 452000 \\ 300 \times 1000 = 300000 \) |
b)
\(80:10 = 8; \\ 300:10 = 30; \\ 2000:10 = 200; \) |
\(400:100 = 4 \\ 4000:100 = 40 \\ 40000:100 = 400 \) |
\(6000:1000 = 6 \\ 60000:1000 = 60 \\ 600000:1000 = 600 \) |
c)
\(64 \times 10 = 640; \\ 640:10 = 64; \) |
\(32 \times 100 = 3200; \\ 3200:100 = 32; \) |
\(95 \times 1000 = 95000 \\ 95000:1000 = 95 \) |
2. Tính:
a)
b)
c)
d)
Hướng dẫn giải
a)
b)
c)
d)
3. Viết số thích hợp vào chỗ chấm:
a) 160 = 16 × …… 4500 = …… × 100 9000 = 9 × …… c) 70000 = …… × 1000 70000 = …… × 100 70000 = …… × 10 |
b) 8000 = …… × 1000 800 = …… × 100 80 = …… × 10 d) 2020000 = … × 10000 2020000 = 2020 × …… 2020000 = …… × 10 |
Hướng dẫn giải
a) 160 = 16 × 10 4500 = 45 × 100 9000 = 9 × 1000 c) 70000 = …… × 1000 70000 = …… × 100 70000 = …… × 10 |
b) 8000 = 8 × 1000 800 = 8 × 100 80 = 8 × 10 d) 2020000 = 202 × 10000 2020000 = 2020 × 1000 2020000 = 202000 × 10 |