一、口算。
$3 + 9 =$ $12 - 8 =$ $3 + 7 + 6 =$
$15 - 9 =$ $6 + 9 =$ $11 - 7 + 8 =$
$7 + 7 =$ $8 - 8 =$ $9 + 6 - 7 =$
$15 - 7 =$ $7 + 4 =$ $10 + 8 - 9 =$
$5 + 7 =$ $18 - 10 =$ $9 + 5 + 4 =$
$11 - 7 =$ $7 + 9 =$ $8 + 7 - 9 =$
$18 + 1 =$ $11 - 2 =$ $5 + 8 + 4 =$
$13 - 8 =$ $13 + 5 =$ $13 - 4 - 4 =$
$6 + 5 =$ $8 + 3 =$ $15 - 6 + 8 =$
$17 - 9 =$ $10 - 3 =$ $19 - 9 - 9 =$

一、12 4 16
6 15 12
14 0 8
8 11 9
12 8 18
4 16 6
19 9 17
5 18 5
11 11 17
8 7 1

二、在$◯$里填“＞”“＜”或“=”。
$16 - 9 ◯ 8$ $18 - 9 ◯ 9$ $12 - 8 ◯ 14 - 9$
$14 - 8 ◯ 6$ $7 + 6 ◯ 12$ $13 - 7 ◯ 13 - 6$
$8 + 5 ◯ 11$ $15 - 8 ◯ 7$ $12 - 4 ◯ 19 - 10$

二、＜ = ＜
= ＞ ＜
＞ = ＜