12ページ減法
図00減法
③小数や数の減法
(1)(+5)-(+3)=+2
(1) O-(+4)=-4
(1) (-0.3)-(+0.4)=-0.7
(2)(+4)-(+9)=-5
(2)0-(-9)=+9 (2)(+1)=(-1)=+=+
(3)(+7)-(-2)=+9
(3) (-7)+0=-7
(4)(-3)-(+8)= -1
(5)(-5)-(-6)=+1
13ページ回減法
(1)(-2)-(+5)=-7
(2)(+10)-(-15)=+25 (2)(-2)-(-0.7)= -1.3
(3)(-7)-(-4)=-3
(4)(-13)-(-13)=0
(5) 0-(-18)=-18
2 小数や分数の減法
(1)(+0.9)-(+1.5)=-0.6
(3)(一号)-(-1/2)=-1/2=-1/
(4)(-3)-(+0.2)=-23108=一号
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