1. 看一看,填一填。

$12-$
$12-$
5
$=$7
$$答案
12-5=7
解析
从图中可知,共有12根小棒,虚线框住5根,即减去5。计算12-5时,把12分成10和2,先算10-5=5,再算5+2=7,所以12-5=7。
2. 算一算。
$12 - 3=$
$14 - 5=$
$11 - 2=$
$13 - 4=$
$13 - 5=$
$12 - 4=$
$14 - 6=$
$15 - 7=$
$12 - 3=$
9
$14 - 5=$
9
$11 - 2=$
9
$13 - 4=$
9
$13 - 5=$
8
$12 - 4=$
8
$14 - 6=$
8
$15 - 7=$
8
答案
$12 - 3 = 9$
$14 - 5 = 9$
$11 - 2 = 9$
$13 - 4 = 9$
$13 - 5 = 8$
$12 - 4 = 8$
$14 - 6 = 8$
$15 - 7 = 8$
$14 - 5 = 9$
$11 - 2 = 9$
$13 - 4 = 9$
$13 - 5 = 8$
$12 - 4 = 8$
$14 - 6 = 8$
$15 - 7 = 8$
3. 算一算,比一比。

$11 - 2 = 9$
$11 - 4 = 7$
$11 - 6 = 5$
$12 - 3 = 9$
$12 - 5 = 7$
$12 - 7 = 5$
$13 - 6 = 7$
$13 - 5 = 8$
$13 - 4 = 9$
$11 - 2 = 9$
$11 - 4 = 7$
$11 - 6 = 5$
$12 - 3 = 9$
$12 - 5 = 7$
$12 - 7 = 5$
$13 - 6 = 7$
$13 - 5 = 8$
$13 - 4 = 9$
答案
$11 - 2 = 9$
$11 - 4 = 7$
$11 - 6 = 5$
$12 - 3 = 9$
$12 - 5 = 7$
$12 - 7 = 5$
$13 - 6 = 7$
$13 - 5 = 8$
$13 - 4 = 9$
$11 - 4 = 7$
$11 - 6 = 5$
$12 - 3 = 9$
$12 - 5 = 7$
$12 - 7 = 5$
$13 - 6 = 7$
$13 - 5 = 8$
$13 - 4 = 9$
4. 看图列式计算。

12
-4
=8
(块)11
-3
=8
(支)答案
$12-4=8$(块)
$11-3=8$(支)
$11-3=8$(支)
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