1. 看图写算式。
(1)
$□+□= □$ $□+□= □$
$□-□= □$ $□-□= □$
(个)
(3)
$□◯□=□$(本)
(1)
$□+□= □$ $□+□= □$
$□-□= □$ $□-□= □$
(个)
(3)
$□◯□=□$(本)
答案
1.
(1)10+5=15 5+10=15 15-5=10 15-10=5;
(2)5+12=17(或12+5=17);
(3)19-5=14
(1)10+5=15 5+10=15 15-5=10 15-10=5;
(2)5+12=17(或12+5=17);
(3)19-5=14
2. 细心算一算。
$10 + 2 = $ $12 + 6 = $ $11 + 7 = $ $6 + 4 + 4 = $
$10 + 6 = $ $19 - 5 = $ $18 - 4 = $ $12 - 2 + 6 = $
$17 - 6 = $ $17 - 2 = $ $13 - 3 = $ $6 + 10 - 4 = $
$10 + 2 = $ $12 + 6 = $ $11 + 7 = $ $6 + 4 + 4 = $
$10 + 6 = $ $19 - 5 = $ $18 - 4 = $ $12 - 2 + 6 = $
$17 - 6 = $ $17 - 2 = $ $13 - 3 = $ $6 + 10 - 4 = $
答案
12 18 18 14 16 14 14 16 11 15 10 12
3. 算一算,填一填。
答案
15 14 18 10 8 13
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