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1. 直接写出得数。
$1700 - 800 =$ $18 + 63 =$ $1200 - 900 =$ $62 - 18 + 24 =$
$100 - 43 =$ $44 + 28 =$ $7000 - 4000 =$ $59 + 16 - 31 =$
$89 - 37 =$ $64 - 30 =$ $400 + 5600 =$ $270 - 70 + 50 =$
$4600 - 600 =$ $25 + 69 =$ $4000 - 500 =$ $92 - 49 + 32 =$
$56 + 37 =$ $67 + 23 =$ $2900 - 600 =$ $89 - 36 - 40 =$
$76 - 39 =$ $520 - 90 =$ $2300 - 700 =$ $90 + 60 - 70 =$
$84 - 27 =$ $26 + 33 =$ $2800 + 900 =$ $86 - 29 + 25 =$
$19 + 81 =$ $80 - 36 =$ $8000 - 800 =$ $70 - 64 + 53 =$
$1700 - 800 =$ $18 + 63 =$ $1200 - 900 =$ $62 - 18 + 24 =$
$100 - 43 =$ $44 + 28 =$ $7000 - 4000 =$ $59 + 16 - 31 =$
$89 - 37 =$ $64 - 30 =$ $400 + 5600 =$ $270 - 70 + 50 =$
$4600 - 600 =$ $25 + 69 =$ $4000 - 500 =$ $92 - 49 + 32 =$
$56 + 37 =$ $67 + 23 =$ $2900 - 600 =$ $89 - 36 - 40 =$
$76 - 39 =$ $520 - 90 =$ $2300 - 700 =$ $90 + 60 - 70 =$
$84 - 27 =$ $26 + 33 =$ $2800 + 900 =$ $86 - 29 + 25 =$
$19 + 81 =$ $80 - 36 =$ $8000 - 800 =$ $70 - 64 + 53 =$
答案
1. 900 81 300 68 57 72 3000 44 52 34 6000 250 4000 94 3500 75 93 90 2300 13 37 430 1600 80 57 59 3700 82 100 44 7200 59
2. 用竖式计算，带 * 的要验算。
$587 - 309 =$ $856 + 367 =$ * $638 - 474 =$
$68 + 457 + 143 =$ $567 - 369 - 178 =$ $700 - 168 + 126 =$
$587 - 309 =$ $856 + 367 =$ * $638 - 474 =$
$68 + 457 + 143 =$ $567 - 369 - 178 =$ $700 - 168 + 126 =$
答案
2. 278 1223 164 668 20 658 竖式及验算略
一捆电线，第一次用去一半，第二次用去剩下的一半，最后还剩 169 米。原来这捆电线长(
676
)米。答案
思维提升 676
