一、口算。
$5 + 7 =$ $8 + 30 =$ $64 - 60 + 8 =$
$14 - 9 =$ $50 + 40 =$ $32 - 2 + 40 =$
$75 - 70 =$ $36 - 6 =$ $15 - 7 + 60 =$
$7 + 7 =$ $5 + 80 =$ $23 - 3 + 8 =$
$10 + 3 =$ $60 - 30 =$ $13 - 6 + 20 =$
$16 - 7 =$ $84 - 80 =$ $48 - 8 + 5 =$
$14 - 5 =$ $30 + 6 =$ $20 + 10 + 30 =$
$6 + 9 =$ $67 - 7 =$ $4 + 8 - 6 =$
$11 - 3 =$ $96 - 90 =$ $62 - 60 + 8 =$
$16 - 8 =$ $9 + 80 =$ $47 - 40 + 5 =$

一、12 38 12
5 90 70
5 30 68
14 85 28
13 30 27
9 4 45
9 36 60
15 60 6
8 6 10
8 89 12

二、比一比，连一连。

二、