1. 直接写出得数。
6400 - 400 = 30 + 30 = 5300 - 300 = 68 - 41 =
7600 - 7000 = 300 + 300 = 6600 - 6000 = 42 + 34 =
8000 - 2000 = 300 + 30 = 40 + 500 = 400 + 6000 =
5700 - 700 = 40 + 50 = 1400 - 400 = 6700 - 700 =
300 + 8000 = 630 - 600 = 40 + 800 = 8800 - 8000 =
2400 - 400 = 730 - 30 = 7300 - 300 = 4600 - 600 =
3900 - 3000 = 4100 - 100 = 1400 - 400 = 700 + 100 =
400 + 8000 = 1000 + 7000 = 680 - 80 = 70 + 300 =

1. 6000 60 5000 27
600 600 600 76
6000 330 540 6400
5000 90 1000 6000
8300 30 840 800
2000 700 7000 4000
900 4000 1000 800
8400 8000 600 370

2. 在$◯$里填“$＞$”“$＜$”或“$=$”。
3756$◯$4284 1289$◯$1291 8350$◯$8260
5206$◯$5084 1171$◯$1099 4387$◯$4690
1200 - 200$◯$300 + 100 4500 - 4000$◯$520 - 20

2. ＜ ＜ ＞
＞ ＞ ＜
＞ =

3. 下面各数约等于几千？
7860≈ 3921≈ 3299≈ 7088≈
5940≈ 8109≈ 5005≈ 6989≈

3. 8000 4000 3000 7000
6000 8000 5000 7000

$\boxed{☆ + ☆ + ☆ + ○ = 9000} \boxed{☆ = (\quad)}$$\boxed{☆ + ☆ + △ = 4600} \boxed{○ = (\quad)}$
$\boxed{☆ + ☆ + ○ = 7000} \boxed{△ = (\quad)}$

·思维提升
2000 3000 600