一、口算。
$7×7=$         $60 - 25 =$         $24÷6 =$
$33 + 44 =$         $8×8 =$         $43÷7 =$
$5×5 =$         $4×4 =$         $38÷5 =$
$27 + 56 =$         $35 + 28 =$         $50÷8 =$
$3×3 =$         $70 - 36 =$         $17÷7 =$
$6×6 =$         $2×2 =$         $31÷8 =$
$81 - 52 =$         $62 - 25 =$         $54÷9 =$
$6×7 =$         $4×9 =$         $14÷4 =$
$94 - 46 =$         $9×9 =$         $30÷6 =$
$63 - 45 =$         $57 + 19 =$         $34÷5 =$

$7×7=49$，$60 - 25=35$，$24÷6=4$
$33 + 44=77$，$8×8=64$，$43÷7=6······1$
$5×5=25$，$4×4=16$，$38÷5=7······3$
$27 + 56=83$，$35 + 28=63$，$50÷8=6······2$
$3×3=9$，$70 - 36=34$，$17÷7=2······3$
$6×6=36$，$2×2=4$，$31÷8=3······7$
$81 - 52=29$，$62 - 25=37$，$54÷9=6$
$6×7=42$，$4×9=36$，$14÷4=3······2$
$94 - 46=48$，$9×9=81$，$30÷6=5$
$63 - 45=18$，$57 + 19=76$，$34÷5=6······4$

二、看图填一填。

二、2 6 12
1. 3
2. 答案不唯一,如 6
3. 2