1. 算一算。
$3 + 1 = $
$10 - 2 = $
$4 + 2 = $
$8 - 4 = $
$3 + 1 + 2 = $
$10 - 2 - 4 = $
想一想,说一说:每一列的第三个算式和前两个算式有什么联系呢?
$3 + 1 = $
$10 - 2 = $
$4 + 2 = $
$8 - 4 = $
$3 + 1 + 2 = $
$10 - 2 - 4 = $
想一想,说一说:每一列的第三个算式和前两个算式有什么联系呢?
答案
(竖排)4 6 6 8 4 4
(想一想,说一说略)
(想一想,说一说略)
2. 看谁算得都对。
$4 + 3 + 1 = $
$2 + 5 + 3 = $
$10 - 4 - 5 = $
$5 + 2 + 2 = $
$9 - 2 - 7 = $
$6 - 1 - 3 = $
$4 + 3 + 1 = $
$2 + 5 + 3 = $
$10 - 4 - 5 = $
$5 + 2 + 2 = $
$9 - 2 - 7 = $
$6 - 1 - 3 = $
答案
8 10 1 9 0 2
3. 看图填算式。
(1)
$7 + □ + □ = □$
(2)
$9 - □ - □ = □$
(3)
$□ ◯ □ ◯ □ = □$
(个)
(4)
$□ ◯ □ ◯ □ = □$
(朵)
(1)
$7 + □ + □ = □$
(2)
$9 - □ - □ = □$
(3)
$□ ◯ □ ◯ □ = □$
(4)
$□ ◯ □ ◯ □ = □$
答案
(1)7+2+1=10
(2)9-3-4=2
(3)3+5+2=10
(4)8-2-2=4
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