1. 直接写出得数。(每题 1★)
$11 - 8 = $ $16 - 8 = $ $15 + 3 - 8 = $
$14 - 8 = $ $13 - 7 = $ $17 - 8 + 9 = $
$4 + 9 = $ $15 - 8 = $ $15 - 7 - 8 = $
$2 + 9 = $ $18 - 7 = $ $16 - 7 + 5 = $
$10 - 7 = $ $15 - 6 = $ $12 - 8 + 4 = $
$17 - 7 = $ $9 + 3 = $ $11 + 5 - 7 = $
$16 - 9 = $ $11 - 6 = $ $7 + 6 - 7 = $
$12 - 6 = $ $9 + 6 = $ $14 - 7 - 7 = $
$17 - 8 = $ $12 - 7 = $ $6 + 9 - 8 = $
$14 - 6 = $ $13 - 6 = $ $12 - 8 + 9 = $
$11 - 7 = $ $11 - 9 = $ $5 + 5 - 6 = $
$13 - 8 = $ $15 - 7 = $ $14 - 6 + 5 = $
$11 - 8 = $ $16 - 8 = $ $15 + 3 - 8 = $
$14 - 8 = $ $13 - 7 = $ $17 - 8 + 9 = $
$4 + 9 = $ $15 - 8 = $ $15 - 7 - 8 = $
$2 + 9 = $ $18 - 7 = $ $16 - 7 + 5 = $
$10 - 7 = $ $15 - 6 = $ $12 - 8 + 4 = $
$17 - 7 = $ $9 + 3 = $ $11 + 5 - 7 = $
$16 - 9 = $ $11 - 6 = $ $7 + 6 - 7 = $
$12 - 6 = $ $9 + 6 = $ $14 - 7 - 7 = $
$17 - 8 = $ $12 - 7 = $ $6 + 9 - 8 = $
$14 - 6 = $ $13 - 6 = $ $12 - 8 + 9 = $
$11 - 7 = $ $11 - 9 = $ $5 + 5 - 6 = $
$13 - 8 = $ $15 - 7 = $ $14 - 6 + 5 = $
答案
3 8 10 6 6 18
13 7 0 11 11 14
3 9 8 10 12 9
7 5 6 6 15 0
9 5 7 8 7 13
4 2 4 5 8 13
13 7 0 11 11 14
3 9 8 10 12 9
7 5 6 6 15 0
9 5 7 8 7 13
4 2 4 5 8 13
2. 看谁先跑到终点。(算一算)(每空 1★)

答案
- 对于第一行:
- 先算$7 + 9 = 16$;
- 再算$16-8 = 8$;
- 接着算$8 + 7 = 15$;
- 最后算$15-6 = 9$。
- 对于第二行:
- 先算$12-6 = 6$;
- 再算$6 + 8 = 14$;
- 接着算$14-7 = 7$;
- 最后算$7 + 10 = 17$。
- 对于第三行:
- 先算$4 + 8 = 12$;
- 再算$12-7 = 5$;
- 接着算$5 + 6 = 11$;
- 最后算$11-8 = 3$。
第一行:$16$、$8$、$15$、$9$;
第二行:$6$、$14$、$7$、$17$;
第三行:$12$、$5$、$11$、$3$。
- 先算$7 + 9 = 16$;
- 再算$16-8 = 8$;
- 接着算$8 + 7 = 15$;
- 最后算$15-6 = 9$。
- 对于第二行:
- 先算$12-6 = 6$;
- 再算$6 + 8 = 14$;
- 接着算$14-7 = 7$;
- 最后算$7 + 10 = 17$。
- 对于第三行:
- 先算$4 + 8 = 12$;
- 再算$12-7 = 5$;
- 接着算$5 + 6 = 11$;
- 最后算$11-8 = 3$。
第一行:$16$、$8$、$15$、$9$;
第二行:$6$、$14$、$7$、$17$;
第三行:$12$、$5$、$11$、$3$。
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