一、口算。
$2 + 9 =$ $13 - 5 =$ $34 - 30 =$
$89 - 9 =$ $20 + 60 =$ $8 + 40 =$
$4 + 50 =$ $14 - 10 =$ $80 - 30 =$
$17 - 9 =$ $9 + 7 =$ $60 + 7 =$
$5 + 90 =$ $74 - 70 =$ $56 - 6 =$
$18 - 9 =$ $70 + 20 =$ $9 + 9 =$
$6 + 8 =$ $45 - 5 =$ $63 - 3 =$
$70 - 10 =$ $3 + 40 =$ $30 + 7 =$
$50 + 5 =$ $11 - 9 =$ $65 - 5 =$
$83 - 80 =$ $20 + 4 =$ $8 + 50 =$

一、11 8 4
80 80 48
54 4 50
8 16 67
95 4 50
9 90 18
14 40 60
60 43 37
55 2 60
3 24 58

二、在$◯$里填“＞”“＜”或“=”。
$7 + 20◯72$ $75 - 5◯78$ $30 + 20◯50$
$68 - 60◯6$ $20 + 8◯30$ $6 + 40◯46$
$9 + 40◯94$ $40 - 30◯9$ $37 - 7◯30$

二、＜ ＜ =
＞ ＜ =
＜ ＞ =