一、口算。
$15 - 6 =$
$11 - 6 =$
$16 - 8 - 8 =$
$18 - 5 =$
$9 + 5 =$
$8 + 4 - 9 =$
$11 - 2 =$
$10 - 2 =$
$12 - 9 + 8 =$
$12 + 0 =$
$13 - 7 =$
$5 + 9 - 6 =$
$12 - 9 =$
$9 + 4 =$
$12 - 6 + 7 =$
$11 - 5 =$
$15 - 8 =$
$6 + 6 - 8 =$
$5 + 8 =$
$8 + 9 =$
$3 + 9 + 6 =$
$12 - 2 =$
$9 + 6 =$
$13 - 7 + 6 =$
$3 + 8 =$
$16 - 6 =$
$5 + 6 - 9 =$
$17 - 9 =$
$13 - 4 =$
$11 - 3 + 8 =$

一、9 5 0
13 14 3
9 8 11
12 6 8
3 13 13
6 7 4
13 17 18
10 15 12
11 10 2
8 9 16

二、在$◯$里填“＞”“＜”或“=”。
$4 + 5◯10$
$12 - 5◯7$
$15 - 9◯13 - 5$
$14 - 8◯5$
$18 - 9◯8$
$4 + 9◯7 + 6$
$7 + 10◯15$
$12 - 4◯8$
$15 - 7◯15 - 6$

二、＜ = ＜
＞ ＞ =
＞ = ＜