1. 直接写出得数。
60 - 14 = 800 - 500 = 57 - 35 = 2700 - 2000 - 700 =
880 - 350 = 52 - 27 = 24 + 58 = 1300 - 300 + 600 =
60 + 90 = 64 - 39 = 19 + 35 = 640 - 40 + 50 =
77 - 46 = 31 + 49 = 130 - 40 = 15 + 75 - 20 =
1800 - 500 = 300 + 800 = 91 - 45 = 470 - 70 + 500 =
60 + 25 = 86 - 32 = 170 + 30 = 82 - 15 - 55 =
75 - 28 = 54 - 48 = 130 - 20 = 24 + 66 + 10 =
495 - 100 = 63 - 36 = 70 + 300 = 80 + 80 + 90 =

1. 46 300 22 0
530 25 82 1600
150 25 54 650
31 80 90 70
1300 1100 46 900
85 54 200 12
47 6 110 100
395 27 370 250

2. 用竖式计算，带*的要验算。
327 - 15 = 846 - 413 = * 645 - 302 =
588 - 262 = 413 - 211 = * 958 - 742 =

2. 312 433 343
326 202 216
竖式及验算略

在一道减法算式中，被减数减少了148，减数减少了365，差是589，原来的差是多少？

思维提升
589 - 365 = 224 224 + 148 = 372