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算算看,左邊的算式和右邊的算式結果相同嗎?相同的在□裡打 。 (1)85+34+71 □ 85+(34+71) (2)92-66-41 □ 92-(66-41)

算算看,左邊的算式和右邊的算式結果相同嗎?相同的在□裡打 。 (1)85+34+71 □ 85+(34+71) (2)92-66-41 □ 92-(66-41) (3)6×5×9 □ 6×(5×9) (4)84÷6÷2 □ 84÷(6÷2) 你做對了嗎?. . . 小丑叔叔在遊樂園區內賣氣球,每顆售價 25 元 ,上午賣出 44 顆 ,下午賣出 33 顆 ,請問小丑叔叔今天的收入是多少元呢?. 25×44+25×33 =1100+825 =1925. 25×(44+33) =25×77 =1925. 答:整天的收入是 1925 元.

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算算看,左邊的算式和右邊的算式結果相同嗎?相同的在□裡打 。 (1)85+34+71 □ 85+(34+71) (2)92-66-41 □ 92-(66-41)

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  1. 算算看,左邊的算式和右邊的算式結果相同嗎?相同的在□裡打 。 (1)85+34+71 □ 85+(34+71) (2)92-66-41 □ 92-(66-41) (3)6×5×9 □ 6×(5×9) (4)84÷6÷2 □ 84÷(6÷2) 你做對了嗎?  

  2. 小丑叔叔在遊樂園區內賣氣球,每顆售價25元,上午賣出44顆,下午賣出33顆,請問小丑叔叔今天的收入是多少元呢?小丑叔叔在遊樂園區內賣氣球,每顆售價25元,上午賣出44顆,下午賣出33顆,請問小丑叔叔今天的收入是多少元呢? 25×44+25×33 =1100+825 =1925 25×(44+33) =25×77 =1925 答:整天的收入是1925元 25×44+25×33和25×(44+33)的算式不一樣但是答案一樣呢!

  3. 隔壁老王跟王媽媽上街去買晚上要煮火鍋的羊肉,羊肉片每公斤50元,老王買了4公斤、王媽媽買了8公斤,王媽媽比老王多付了多少元?隔壁老王跟王媽媽上街去買晚上要煮火鍋的羊肉,羊肉片每公斤50元,老王買了4公斤、王媽媽買了8公斤,王媽媽比老王多付了多少元? 50×8-50×4 =400-200 =200 50×(8-4) =50×4 =200 答:多付了200元

  4. 五年一班要到校外參觀,準備去參觀凱蒂貓博物館,博物館門票每張202元,全班35人共要付多少元?五年一班要到校外參觀,準備去參觀凱蒂貓博物館,博物館門票每張202元,全班35人共要付多少元? 202 × 35 1010 +6060 7070 更方便的算法: 202×35 =(200+2)×35 =200×35+2×35 =7000+70=7070 答:共要付7070元

  5. 你會用比較方便的方法,算出114×40的答案嗎?把作法記下來吧?你會用比較方便的方法,算出114×40的答案嗎?把作法記下來吧? 114 × 40 0 +4560 4560 更方便的算法: 114×40 =(110+4)×40 =110×40+4×40 =4400+160=4560

  6. 媽媽去超市買6盒布丁,花了108元;買2盒比薩,花了900元,請問一盒比薩比一盒布丁貴多少元?媽媽去超市買6盒布丁,花了108元;買2盒比薩,花了900元,請問一盒比薩比一盒布丁貴多少元? 900÷2-108÷6 =450-18 =432 答:貴432元

  7. 乘法或除法計算時,先將各個位數拆開(或相加),讓它成為方便乘除的數字後再計算,就能很快的算出答案喔!乘法或除法計算時,先將各個位數拆開(或相加),讓它成為方便乘除的數字後再計算,就能很快的算出答案喔!

  8. 想一想,怎麼算比較好算?再算算看 325÷25+175÷25 205×18 趕快算算看喔!

  9. 想一想,怎麼算比較好算?再算算看 325÷25+175÷25 = (325+175) ÷ 25 = 500 ÷ 25 = 20 你是這樣算的嗎?

  10. 想一想,怎麼算比較好算?再算算看 205×18 = (200+5) ×18 = 200×18 + 5×18 = 3600+90 = 3690 你是這樣算的嗎?

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