1. 直接写出得数。
$65 - 50 = $
$20 + 32 = $
$65 - 50 = $
15
$38 - 7 = $31
$15 + 40 = $55
$79 - 6 = $73
$20 + 32 = $
52
$89 - 60 = $29
$32 + 6 = $38
$45 - 40 = $5
答案
15
31
55
73
52
29
38
5
31
55
73
52
29
38
5
2. 在$◯$里填上“+”或“-”。
$41◯$
$7◯$
$41◯$
-
$8 = 33$ $17◯$-
$8 = 9$ $15◯$+
$8 = 8◯$+
$15$$7◯$
+
$36 = 43$ $37◯$-
$30 = 7$ $50◯$+
$5◯$+
$5 = 60$答案
$-$ $-$ $+$ $+$ $-$ $+$ $+$
3. 在( )里填上合适的数。
$30 + (
$65 - (
$30 + (
60
) = 90$ $56 - (7
) = 49$ $30 + (68
) = 38 + 60$$65 - (
5
) = 60$ $45 + (15
) = 60$ $45 - 8 = (29
) + 8$答案
$30 + (60) = 90$
$56 - (7) = 49$
$30 + (68) = 38 + 60$
$65 - (5) = 60$
$45 + (15) = 60$
$45 - 8 = (29) + 8$
$56 - (7) = 49$
$30 + (68) = 38 + 60$
$65 - (5) = 60$
$45 + (15) = 60$
$45 - 8 = (29) + 8$
4. 填表。

(注:因图片无法直接显示,根据答案推测表格对应空依次填入:
(注:因图片无法直接显示,根据答案推测表格对应空依次填入:
51
;71
;72
;27
)答案
51;71;72;27
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