一、口算。
$52 - 33 =$ $8×5 =$ $30÷5 =$
$2×6 =$ $27 + 46 =$ $52÷8 =$
$70 - 41 =$ $7×3 =$ $40÷7 =$
$9×6 =$ $25 + 53 =$ $26÷6 =$
$83 - 47 =$ $4×8 =$ $30÷4 =$
$3×9 =$ $56 - 38 =$ $36÷9 =$
$43 + 29 =$ $6×6 =$ $25÷3 =$
$5×9 =$ $55 - 28 =$ $16÷2 =$
$43 + 37 =$ $4×3 =$ $32÷7 =$
$5×5 =$ $45 - 27 =$ $48÷8 =$

一、19 40 6
12 73 6……4
29 21 5……5
54 78 4……2
36 32 7……2
27 18 4
72 36 8……1
45 27 8
80 12 4……4
25 18 6

二、下面物体的长度各是几厘米？填一填。

二、6 3 5