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⑪ (+1.1)-(+0.9)
⑫ (+0.7)-(+1.5)
⑬ (-1.3)-(+0.8)
〇次の計算をしなさい。
① (+3)-(+6)
⑭ (-0.08)-(-0.03)
② (-23)-(+8)
⑮ ( )-( )
③ (-3)-(+12)
⑯ ( )-( )
④ (+6)-(+2)
⑰ ( )-( )
⑤ 0-(-13)
⑱ ( )-( )
⑥ (-7)-0
⑲ (+0.04)-(-0.09)
⑦ (-23)-(-5)
⑳ (-1.05)-(+0.25)
⑧ (-3)-(-11)
⑨ (-26)-(-6)
⑩ (-4)-(-5)
=( )+( )=-( + )=
=(+0.04)+(+0.09)
=+0.13
=(-1.05)+(-0.25)
=-(1.05+0.25)
=-1.3
=(-0.08)+(+0.03)
=-(0.08-0.03)
=-0.05
=( )+( )=-( + )=
=( )+( )=( + )=
=( )+( )=-( - )=
=-7
=(-23)+(+5)
=-(23-5)
=-18
=(-3)+(+11)
=+(11-3)
=+8
=(-26)+(+6)
=-(26-6)
=-20
=(-4)+(+5)
=+(5-4)
=+1
=(+3)+(-6)
=-(6-3)
=-3
=(-23)+(-8)
=-(23+8)
=-31
=(-3)+(-12)
=-(12+3)
=-15
=(+6)+(-2)
=+(6-2)
=+4 =0+(+13)
=+13
=(+1.1)+(-0.9)
=+(1.1-0.9)
=0.2
=(+0.7)+(-1.5)
=-(1.5-0.7)
=-0.8
=(-1.3)+(-0.8)
=-(1.3+0.8)
=-2.1
7
1章 正の数・負の数正の数・負の数の減法
日付減法
ひき算のことを「減法(げんぽう)」という。
例1) (+5)-(-3)=(+5)+(+3)=+8 例2) (-3)-(+7)=(-3)+(-7)=-10
※符号を変えた数をたすとよい。
1
Point!
+
+ -
- -
- +
- -
+ -
+ -
-
-