1. 在符合情境的算式后面画“√”。(建议2分钟完成)
(1)
$3-1= 2$
(2)
$5-1= 4$ □ $4-1= 3$
(1)
√
$2-1= 1$ □ (2)
√
答案:
(1)√ □
(2)□ √
(1)√ □
(2)□ √
$4-1=
3
$ $5-2=3
$ $4-3=1
$
答案:
3 3 1
3. 直接写出得数。(建议3分钟完成)
$5-1= $
$5-3= $
$2+2= $
$4-3= $
$4-1= $
$5-1= $
4
$4-2= $2
$2-1= $1
$1+2= $3
$5-3= $
2
$2+3= $5
$1+3= $4
$5-2= $3
$2+2= $
4
$3+1= $4
$1+4= $5
$5-4= $1
$4-3= $
1
$3+2= $5
$3-2= $1
$2+1= $3
$4-1= $
3
$1+1= $2
$3-1= $2
$4+1= $5
答案:
4 2 1 3 2 5 4 3 4 4 5 1 1 5 1 3 3 2 2 5
$3-
$5-
$
2
= 1$ $4
-1= 3$ $4-3
= 1$ $3
-1= 2$$5-
4
= 1$ $4-1
= 3$ $3
-2= 1$ $5
-1= 4$$
4
-3= 1$ $5-2
= 3$ $4-2
= 2$ $2-1
= 1$
答案:
2 4 3 3 4 1 3 5 4 2 2 1
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