1. 直接写出得数。
$40 + 80 =$ $1300 - 300 =$ $1100 - 1000 =$ $350 - 300 + 70 =$
$170 - 90 =$ $26 + 34 =$ $1800 - 800 =$ $50 + 60 - 80 =$
$30 - 14 =$ $5700 - 5000 =$ $8400 - 400 =$ $46 + 48 - 12 =$
$52 - 45 =$ $250 - 50 =$ $7000 + 70 =$ $600 + 50 - 50 =$
$48 + 42 =$ $600 + 60 =$ $2400 - 400 =$ $90 - 15 + 18 =$
$160 - 80 =$ $500 + 50 =$ $7000 - 6000 =$ $35 + 59 - 19 =$
$1200 - 200 =$ $5500 - 500 =$ $5000 + 700 =$ $40 + 70 - 100 =$
$300 + 600 =$ $4000 + 300 =$ $4900 - 900 =$ $80 + 90 - 70 =$

1. 120 1000 100 120
80 60 1000 30
16 700 8000 82
7 200 7070 600
90 660 2000 93
80 550 1000 75
1000 5000 5700 10
900 4300 4000 100

2. 用竖式计算。
$84 + 612 =$ $513 + 235 =$ $275 + 713 =$
$113 + 76 =$ $275 + 523 =$ $462 + 407 =$

2. 696 748 988
189 798 869
竖式略

移动下面一根火柴棒，使算式成立。

移动后的算式是()。

思维提升
134 + 155 = 289