1. $41 - 6 = $
$70 - 5 = $
$63 - 40 = $
$50 - 5 - 20 = $
35
$63 + 9 = $72
$78 + 9 = $87
$70 - 5 = $
65
$3 + 67 = $70
$38 - 6 = $32
$63 - 40 = $
23
$30 + 18 = $48
$40 + 50 = $90
$50 - 5 - 20 = $
25
$24 - 7 + 30 = $47
$78 - (28 + 2) = $48
答案
35;72;87
65;70;32
23;48;90
25;47;48
65;70;32
23;48;90
25;47;48
2. 填一填。
(
(
(
(
7
)+(8
)= 15 (6
)+(5
)= 11(
7
)+(4
)+(4
)= 15 (3
)+(3
)+(5
)= 11(
7
)+(4
)+(2
)+(2
)= 15答案
填一填。
7 + 8 = 15;6 + 5 = 11
7 + 4 + 4 = 15;3 + 3 + 5 = 11
7 + 4 + 2 + 2 = 15
(答案不唯一)
7 + 8 = 15;6 + 5 = 11
7 + 4 + 4 = 15;3 + 3 + 5 = 11
7 + 4 + 2 + 2 = 15
(答案不唯一)
(1)大年三十,小华和爸爸、妈妈围在一起包饺子,小华包了9个,妈妈包了28个,爸爸包了25个。爸爸比小华多包了

25 - 9 = 16
个,妈妈比小华多包了28 - 9 = 19
个,他们一共包了25 + 9 + 28 = 62
个。答案
25 - 9 = 16;28 - 9 = 19;
25 + 9 + 28 = 62
25 + 9 + 28 = 62
(2)公交车上原来有9位乘客,到了第一站,上来6位乘客,无乘客下车。现在车上一共有多少位乘客?到了第二站,无乘客上车,有7位乘客下车,现在车上还有几位乘客?
答案
9 + 6 = 15(位);
15 - 7 = 8(位)
15 - 7 = 8(位)
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