4. 先用小棒摆一摆,再写得数。
1+1=
3+2=
2+2=
4+1=
3-2=
4-3=
4-2=
5-2=
2+1=
1+3=
5-4=
5-3=
1+1=
3+2=
2+2=
4+1=
3-2=
4-3=
4-2=
5-2=
2+1=
1+3=
5-4=
5-3=
答案
1+1=2
3+2=5
2+2=4
4+1=5
3-2=1
4-3=1
4-2=2
5-2=3
2+1=3
1+3=4
5-4=1
5-3=2
3+2=5
2+2=4
4+1=5
3-2=1
4-3=1
4-2=2
5-2=3
2+1=3
1+3=4
5-4=1
5-3=2
1.算一算,填一填。

2 + =
+ =

1 + =
+ =
2 + =
+ =
1 + =
+ =
答案
2 + 1 = 3
2 + 2 = 4
1 + 4 = 5
2 + 3 = 5
2 + 2 = 4
1 + 4 = 5
2 + 3 = 5
2.我会算。

5 - =
4 - =
4 - =
5 - =
5 - =
4 - =
4 - =
5 - =
答案
$5 - \boxed{1} = \boxed{4}$
$4 - \boxed{1} = \boxed{3}$
$4 - \boxed{3} = \boxed{1}$
$5 - \boxed{4} = \boxed{1}$
$4 - \boxed{1} = \boxed{3}$
$4 - \boxed{3} = \boxed{1}$
$5 - \boxed{4} = \boxed{1}$
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