1. 直接写出得数。
61 - 27 =
4500 - 500 =
630 - 200 =
71 - 43 + 20 =
92 - 59 =
700 + 700 =
500 + 600 =
130 - 90 + 36 =
82 - 15 =
100 + 900 =
570 - 170 =
100 - 40 + 20 =
62 - 36 =
1000 - 200 =
500 + 290 =
1800 - 800 + 900 =
90 + 80 =
7800 - 7000 =
840 - 230 =
67 - 28 - 15 =
92 - 37 =
1300 - 300 =
400 + 340 =
56 ÷ 8 × 3 =
52 + 39 =
1500 - 800 =
400 + 1800 =
90 + 30 - 80 =

1. 34 4000 430 48
33 1400 1100 76
67 1000 400 80
26 800 790 1900
170 800 610 24
55 1000 740 21
91 700 2200 40

2. 用竖式计算,带 * 的要验算。
847 - 55 =
651. - 449 =
320 - 226 =
534. - 487 =
915 - 486 =
636 - 289 =

2. 792 202 94
47 429 347
竖式及验算略

思维提升 以图代数

思维提升
305 257 378