乗法
[0]
(+3) ✕ (+7)
=
答え
ｘ
+21
[1]
(+9) ✕ (+3)
=
答え
ｘ
+27
[2]
(+3) ✕ (-7)
=
答え
ｘ
-21
[3]
(+8) ✕ (-5)
=
答え
ｘ
-40
[4]
(-2) ✕ (-7)
=
答え
ｘ
+14
[5]
(-6) ✕ (+5)
=
答え
ｘ
-30
[6]
(-9) ✕ (+4)
=
答え
ｘ
-36
[7]
(-7) ✕ (+7)
=
答え
ｘ
-49
[8]
(+3) ✕ (-8)
=
答え
ｘ
-24
[9]
(-2) ✕ (-5)
=
答え
ｘ
+10
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