Aprenda as regras fundamentais e teste seus conhecimentos
(+) × (+) = (+)
Ex: 3 × 2 = 6
(+) × (−) = (−)
Ex: 3 × (−2) = −6
(−) × (+) = (−)
Ex: (−3) × 2 = −6
(−) × (−) = (+)
Ex: (−3) × (−2) = 6