2014人教版五下：解決問題(數(shù)的奇、偶性).ppt

因數(shù)與倍數(shù),解決問題（奇、偶性）,把下面各數(shù)分別填在合適的圈內(nèi)。3948512074208018976,奇數(shù),偶數(shù),51,39,207,801,48,420,8976,奇數(shù)與偶數(shù)的和是奇數(shù)還是偶數(shù)？奇數(shù)與奇數(shù)的和是奇數(shù)還是偶數(shù)？偶數(shù)與偶數(shù)的和呢？,奇數(shù)：5，7，9，11，偶數(shù)：8，12，20，24，,5712,7916,5813,7815,81220,122436,奇數(shù)奇數(shù)偶數(shù),奇數(shù)偶數(shù)奇數(shù),偶數(shù)偶數(shù)偶數(shù),奇數(shù)與偶數(shù)的和是奇數(shù)還是偶數(shù)？奇數(shù)與奇數(shù)的和是奇數(shù)還是偶數(shù)？偶數(shù)與偶數(shù)的和呢？,-,-,-,奇數(shù)除以2余1,偶數(shù)除以2沒有余數(shù),奇數(shù)加偶數(shù)的和除以2還余1，所以，奇數(shù)偶數(shù)奇數(shù)。,奇數(shù)加奇數(shù)的和除以2沒有余數(shù)，所以，奇數(shù)奇數(shù)偶數(shù)。,偶數(shù)加偶數(shù)的和除以2沒有余數(shù)，所以，偶數(shù)偶數(shù)偶數(shù)。,奇數(shù)與偶數(shù)的和是奇數(shù)還是偶數(shù)？奇數(shù)與奇數(shù)的和是奇數(shù)還是偶數(shù)？偶數(shù)與偶數(shù)的和呢？,偶數(shù),奇數(shù),偶數(shù),奇數(shù)與偶數(shù)的和是奇數(shù)還是偶數(shù)？奇數(shù)與奇數(shù)的和是奇數(shù)還是偶數(shù)？偶數(shù)與偶數(shù)的和呢？,-,-,-,所以，奇數(shù)偶數(shù)奇數(shù),奇數(shù)與偶數(shù)的和是奇數(shù)還是偶數(shù)？奇數(shù)與奇數(shù)的和是奇數(shù)還是偶數(shù)？偶數(shù)與偶數(shù)的和呢？,三、知識運用,三、知識運用,2.奇數(shù)與奇數(shù)的積是奇數(shù)還是偶數(shù)？奇數(shù)與偶數(shù)的積是奇數(shù)還是偶數(shù)？偶數(shù)與偶數(shù)的積呢？,5735,7963,5840,7856,81296,1424336,奇數(shù)奇數(shù)奇數(shù),奇數(shù)偶數(shù)偶數(shù),偶數(shù)偶數(shù)偶數(shù),四、布置作業(yè),作業(yè)：第17頁練習四，第7題。,