1. 直接写出得数。
$96 - 69 =$ $217 ÷ 7 =$ $53 - 38 =$ $15 × 8 - 26 =$
$120 + 76 =$ $424 ÷ 4 =$ $31 - 13 =$ $43 × (6 ÷ 3) =$
$420 + 130 =$ $260 + 140 =$ $180 - 16 =$ $490 ÷ (14 ÷ 2) =$
$798 + 2 =$ $120 - 60 =$ $35 × 30 =$ $630 ÷ 3 ÷ 7 =$
$22 + 88 =$ $320 - 180 =$ $10 × 47 =$ $724 + 40 - 58 =$
$245 - 198 =$ $210 × 4 =$ $46 + 64 =$ $461 - 61 - 58 =$
$\frac{5}{13} + \frac{4}{13} =$ $\frac{7}{10} + \frac{1}{10} =$ $\frac{7}{9} - \frac{4}{9} =$ $32 ÷ (2 × 4) =$
$\frac{11}{14} - \frac{8}{14} =$ $\frac{4}{9} + \frac{2}{9} =$ $\frac{3}{7} + \frac{2}{7} =$ $11 × 20 × 8 =$

1. 27 31 15 94
196 106 18 86
550 400 164 70
800 60 1050 30
110 140 470 706
47 840 110 342
$\frac{9}{13} \frac{8}{10} \frac{3}{9} 4$
$\frac{3}{14} \frac{6}{9} \frac{5}{7} 1760$

2. 用竖式计算，带☆的要验算。
$487 - 129 =$ $784 + 527 =$ ☆$27 × 43 =$

2. 358 1311 1161
570 6720 2773
竖式及验算略

仔细观察例题，照样子巧算。
例：

$53 × 53 =$ $41 × 61 =$
$58 × 58 =$ $64 × 44 =$
$42 × 62 =$ $29 × 89 =$

思维提升
2809 2501
3364 2816
2604 2581