一、口算。
$12 - 7 =$ $6 + 9 =$ $9 + 3 - 7 =$
$5 + 7 =$ $13 - 4 =$ $13 - 8 + 7 =$
$11 - 8 =$ $8 + 7 =$ $14 - 6 - 4 =$
$6 + 8 =$ $16 - 9 =$ $7 + 4 + 7 =$
$14 - 5 =$ $7 + 7 =$ $10 + 2 - 9 =$
$8 + 4 =$ $13 - 5 =$ $17 - 8 + 6 =$
$12 - 9 =$ $8 + 5 =$ $15 - 6 - 6 =$
$3 + 9 =$ $14 - 9 =$ $9 + 7 - 8 =$
$16 - 7 =$ $7 + 9 =$ $4 + 8 + 4 =$
$4 + 7 =$ $6 + 6 =$ $19 - 8 - 8 =$

一、5 15 5
12 9 12
3 15 4
14 7 18
9 14 3
12 8 15
3 13 3
12 5 8
9 16 16
11 12 3

二、在$◯$里填“＞”“＜”或“=”。
$15 - 9◯9$ $11 - 6◯5$ $6 + 7◯12$
$9 + 4◯13$ $1 + 11◯12$ $12 - 3◯6$
$14 - 6◯6$ $8 + 8◯18$ $14 - 7◯7$

二、＜ = ＞
= = ＞
＞ ＜ =