(基礎問題)次の計算をしなさい。目安3分
(1) 0-14
(2) 4-7
(3) 333-555
(4) 2,8-6,4
(5) 1/4 - 2/3
(応用問題)次の計算をしなさい。目安3分
(1) -2+8
(2) -5-4
(3) 3+(-6)
(4) -1-(-9+2)
▼ 解答 ▼
(基礎問題)
(1) 0-14=-14
(2) 4-7=-(7-4)=-3
(3) 333-555=-(555-333)=-222
(4) 2,8-6,4=-(6,4-2,8)=-3,6
(5) 1/4 - 2/3=-(2/3 - 1/4)=- 5/12
(応用問題)
(1) -2+8=6
(2) -5-4=-9
(3) 3+(-6)=3-6=-(6-3)=-3
(4) -1-(-9+2)=-1-(-7)=-1+7=6