4.算一算。
$4+0=$
$0+2=$
$5-0=$
$3-0=$
$0+5=$
$4-4=$
$0+3=$
$4-0=$
$5-5=$
$3-3=$
$2-2=$
$5+0=$
$4+0=$
$0+2=$
$5-0=$
$3-0=$
$0+5=$
$4-4=$
$0+3=$
$4-0=$
$5-5=$
$3-3=$
$2-2=$
$5+0=$
答案
$4+0=4$
$0+2=2$
$5-0=5$
$3-0=3$
$0+5=5$
$4-4=0$
$0+3=3$
$4-0=4$
$5-5=0$
$3-3=0$
$2-2=0$
$5+0=5$
$0+2=2$
$5-0=5$
$3-0=3$
$0+5=5$
$4-4=0$
$0+3=3$
$4-0=4$
$5-5=0$
$3-3=0$
$2-2=0$
$5+0=5$
1.判断对错。(对的画“√”,错的画“×”)
(1)小华有5块糖,送给小丽5块,还剩1块。()
(2)一个也没有可以用数字“0”来表示。()
(1)小华有5块糖,送给小丽5块,还剩1块。()
(2)一个也没有可以用数字“0”来表示。()
答案
(1)×
(2)√
(2)√
2. 想一想,填一填。
2 + =
+ =
3 - =

3 - =
3 - =
2 + =
+ =
3 - =
3 - =
3 - =
答案
$2 + \boxed{0} = \boxed{2}$
$\boxed{0} + \boxed{4} = \boxed{4}$
$3 - \boxed{1} = \boxed{2}$
$3 - \boxed{2} = \boxed{1}$
$3 - \boxed{3} = \boxed{0}$
$\boxed{0} + \boxed{4} = \boxed{4}$
$3 - \boxed{1} = \boxed{2}$
$3 - \boxed{2} = \boxed{1}$
$3 - \boxed{3} = \boxed{0}$
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