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一、我会计算。
$15 - 5 = $
$21 + 7 = $
$46 + 30 = $
$65 + 3 = $
$15 - 5 = $
10
$15 - 7 = $8
$32 + 50 = $82
$20 + 30 + 8 = $58
$21 + 7 = $
28
$32 + 5 = $37
$50 + 20 = $70
$14 + 2 + 3 = $19
$46 + 30 = $
76
$3 + 83 = $86
$43 + 6 = $49
$32 + 4 + 3 = $39
$65 + 3 = $
68
$30 + 40 = $70
$56 + 2 = $58
$17 - 9 + 6 = $14
答案：
10 8 82 58 28 37 70 19 76 86 49 39 68 70 58 14
二、看图填一填。
1.
$38 + 2 =
先算$
再算$
2.
$26 + 7 =
先算$
再算$
1.
$38 + 2 =
40
$先算$
8
+ 2
= 10
$再算$
30
+ 10
= 40
$2.
$26 + 7 =
33
$先算$
6
+ 7
= 13
$再算$
20
+ 13
= 33
$
答案：
1. 40 $8 + 2 = 10$ $30 + 10 = 40$
2. 33 $6 + 7 = 13$ $20 + 13 = 33$
2. 33 $6 + 7 = 13$ $20 + 13 = 33$
三、在$◯$里填上“$＞$”“$＜$”或“$=$”。
$47 + 3 ◯$
$6 + 28 ◯$
$47 + 3 ◯$
=
$50$ $28 + 4 ◯$＜
$36$ $39 + 5 ◯$＜
$42 + 3$$6 + 28 ◯$
＞
$33$ $36 + 8 ◯$＞
$42$ $25 + 9 ◯$＞
$26 + 6$
答案：
= ＜ ＜ ＞ ＞ ＞
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