直接写出得数。 ×4= 16÷ = × = 0.8× = 0.25+ = ×2.4= ÷4= ÷4÷ =

8.1÷0.03=	$\text{[math]}$	$\text{[math]}$	$\text{[math]}$
$\text{[math]}$	0.375×16=	$\text{[math]}$	$\text{[math]}$

口算与估算容易

$\text{[math]}$ ＝	$\text{[math]}$ ×24＝	$\text{[math]}$ ＝	$\text{[math]}$ ＝
1.4× $\text{[math]}$ ＝	$\text{[math]}$ ＝	$\text{[math]}$ ÷3＝	13÷ $\text{[math]}$ ＝

口算与估算容易

1÷ $\text{[math]}$ =	$\text{[math]}$ ÷ $\text{[math]}$ =	$\text{[math]}$ ÷3=	$\text{[math]}$ ÷ $\text{[math]}$ =
$\text{[math]}$ × $\text{[math]}$ =	$\text{[math]}$ ÷ $\text{[math]}$ =	18÷ $\text{[math]}$ =	$\text{[math]}$ + $\text{[math]}$ =

口算与估算容易

$\text{[math]}$ ×15= $\text{[math]}$ ×2= $\text{[math]}$ × $\text{[math]}$ = $\text{[math]}$ × $\text{[math]}$ =

$\text{[math]}$ ÷ $\text{[math]}$ = $\text{[math]}$ ÷3= $\text{[math]}$ ÷5= $\text{[math]}$ ÷ $\text{[math]}$ =

口算与估算普通

$\text{[math]}$ ÷5＝	$\text{[math]}$ ÷14＝	$\text{[math]}$ ÷7＝
$\text{[math]}$ ÷ $\text{[math]}$ ＝	$\text{[math]}$ ÷ $\text{[math]}$ ＝	$\text{[math]}$ ÷ $\text{[math]}$ ＝

口算与估算普通