一、口算。（每题1分，共33分）
$46 + 27 =$ $620 - 40 =$ $56 \div 7 =$
$71 - 24 =$ $7 \times 5 =$ $55 + 25 =$
$25 + 26 =$ $150 - 90 =$ $3200 - 3000 =$
$130 - 50 =$ $66 + 17 =$ $54 + 38 =$
$300 + 400 =$ $880 - 800 =$ $1000 - 700 =$
$400 + 50 =$ $50 + 80 =$ $54 - 46 =$
$63 - 34 =$ $600 + 400 =$ $32 \div 8 =$
$70 + 340 =$ $6 \times 8 =$ $140 - 70 =$
$21 \div 3 =$ $60 + 90 =$ $81 - 23 =$
$12 + 68 =$ $51 - 14 =$ $70 + 160 =$
$89 - 22 =$ $81 \div 9 =$ $45 + 26 =$

73 580 8
47 35 80
51 60 200
80 83 92
700 80 300
450 130 8
29 1000 4
410 48 70
7 150 58
80 37 230
67 9 71

二、在（ ）里填合适的数。（每题1分，共8分）
（ ）$\div 9 = 3\cdots\cdots4$ $9 \times 6 = 302 -$（ ）
$61 \div$（ ）$= 7\cdots\cdots5$ $320 + 400 =$（ ）$- 200$
$26 \div$（ ）$= 4\cdots\cdots2$ $100 -$（ ）$= 8 \times 8$
$120 - 80 = 5 \times$（ ） （ ）$\div 4 = 7\cdots\cdots3$

31 248
8 920
6 36
8 31