直接写出得数。 1-60%= ×0= ×8= 0.8÷= ÷4= 10÷10%=

3.99+0.1= 1÷1%= $\text{[math]}$ ÷3= 6- $\text{[math]}$ = 0.25× $\text{[math]}$ ×4=

5-3.09= $\text{[math]}$ = 4.3+3.57= 1.9-2÷4= 4× $\text{[math]}$ ÷4× $\text{[math]}$ =

口算与估算常考题容易

5.6：21 60%： $\text{[math]}$ $\text{[math]}$ 25：6.5

化简未知容易

1÷ $\text{[math]}$ =	$\text{[math]}$ × $\text{[math]}$ =	$\text{[math]}$ ×21=	（ $\text{[math]}$ ＋ $\text{[math]}$ ）×12=
$\text{[math]}$ ×3=	$\text{[math]}$ ÷ $\text{[math]}$ =	99× $\text{[math]}$ =	$\text{[math]}$ × $\text{[math]}$ ＋ $\text{[math]}$ ÷8=

口算与估算未知容易

$\text{[math]}$ = $\text{[math]}$ = $\text{[math]}$ =

$\text{[math]}$ = $\text{[math]}$ =

口算与估算常考题普通

$\text{[math]}$ ÷ $\text{[math]}$ =	36÷ $\text{[math]}$ =	$\text{[math]}$ × $\text{[math]}$ =	$\text{[math]}$ － $\text{[math]}$ =	$\text{[math]}$ ÷ $\text{[math]}$ =
$\text{[math]}$ ÷ $\text{[math]}$ =	3.4÷ $\text{[math]}$ =	$\text{[math]}$ ÷8=	$\text{[math]}$ ÷ $\text{[math]}$ =	0÷ $\text{[math]}$ =