一、口算。
$13 - 9 =$
$12 - 9 =$
$15 - 9 + 7 =$
$15 - 9 =$
$14 - 9 =$
$14 - 9 - 2 =$
$17 - 9 =$
$16 - 9 =$
$13 - 9 + 6 =$
$19 - 9 =$
$18 - 9 =$
$16 - 9 + 8 =$

$13 - 9$
$= 10 - 9 + 3$
$= 1 + 3$
$= 4$
$12 - 9$
$= 10 - 9 + 2$
$= 1 + 2$
$= 3$
$15 - 9 + 7$
$= (10 - 9 + 5) + 7$
$= (1 + 5) + 7$
$= 6 + 7$
$= 13$
$15 - 9$
$= 10 - 9 + 5$
$= 1 + 5$
$= 6$
$14 - 9$
$= 10 - 9 + 4$
$= 1 + 4$
$= 5$
$14 - 9 - 2$
$= (10 - 9 + 4) - 2$
$= (1 + 4) - 2$
$= 5 - 2$
$= 3$
$17 - 9$
$= 10 - 9 + 7$
$= 1 + 7$
$= 8$
$16 - 9$
$= 10 - 9 + 6$
$= 1 + 6$
$= 7$
$13 - 9 + 6$
$= (10 - 9 + 3) + 6$
$= (1 + 3) + 6$
$= 4 + 6$
$= 10$
$19 - 9$
$= 10 - 9 + 9$
$= 1 + 9$
$= 10$
$18 - 9$
$= 10 - 9 + 8$
$= 1 + 8$
$= 9$
$16 - 9 + 8$
$= (10 - 9 + 6) + 8$
$= (1 + 6) + 8$
$= 7 + 8$
$= 15$

二、圈一圈，算一算。

1. $△△△△△△△△△△$
$△△△△△△$
$16 - 9 =□$
2.
$18 - 9 =□$

1. 圈出9个△
$16 - 9 = 7$
2. 圈出9个苹果
$18 - 9 = 9$

三、在括号里填上合适的数。
$9 + (\quad) = 11$
$6 + (\quad) = 15$
$(\quad) + 6 = 15$
$(\quad) + 9 = 13$
$7 + (\quad) = 16$
$(\quad) + 9 = 12$
$(\quad) + 9 = 17$
$9 + (\quad) = 14$
$(\quad) + 9 = 18$

$11-9=2$，括号里填2
$15-6=9$，括号里填9
$15-6=9$，括号里填9
$13-9=4$，括号里填4
$16-7=9$，括号里填9
$12-9=3$，括号里填3
$17-9=8$，括号里填8
$14-9=5$，括号里填5
$18-9=9$，括号里填9

四、在$◯$里填上“＞”“＜”或“=”。
$16 - 9 ◯ 7$
$15 - 9 ◯ 5$
$13 - 9 ◯ 4$
$14 - 9 ◯ 4$
$15 - 9 ◯ 6$
$17 - 9 ◯ 7$
$11 - 9 ◯ 3$
$13 - 9 ◯ 7$
$18 - 9 ◯ 10$

$16 - 9 = 7$，$16 - 9 = 7$
$15 - 9 = 6$，$6＞5$，$15 - 9 ＞ 5$
$13 - 9 = 4$，$13 - 9 = 4$
$14 - 9 = 5$，$5＞4$，$14 - 9 ＞ 4$
$15 - 9 = 6$，$15 - 9 = 6$
$17 - 9 = 8$，$8＞7$，$17 - 9 ＞ 7$
$11 - 9 = 2$，$2＜3$，$11 - 9 ＜ 3$
$13 - 9 = 4$，$4＜7$，$13 - 9 ＜ 7$
$18 - 9 = 9$，$9＜10$，$18 - 9 ＜ 10$