小學一年級數(shù)學湊十法-破十法-很棒的練習題.doc

湊十法練習題小學一年級數(shù)學-湊十法練習題一、湊十法：(1)、湊十法是20以內進位加法的基本思路。運用“湊十法”能夠將20以內的進位加法轉化為學生所熟悉的10加幾的題目，從而化難為簡。那么“湊十法”在具體計算中是如何“湊”十的呢，我們看以下例題：在計算9+4時，先把4分成1和3，然后9和1湊成10,10再加上3等于13；(2)、湊十歌：1湊9 ， 2湊8 ， 3湊7來， 4湊6 ， 5、5相湊正滿10 做減做加想到它，又對又快真方便！(3)、認識湊十法的規(guī)律性。 不僅可以在解決20以內進位加法的計算中用到，在不進位加法中也可以用到。以下邊例子說明：如在計算14+5時，先把14分成10和4，然后4和5先加等于9，然后再和前邊的10相加等于19； 二、借十法：(1)、借十法 是用在20以內退位減法的計算方法運用借十法可將20以內的退位減法轉化為學生所熟悉的10減幾的題目，從而化難為簡。那么“借十法”在具體計算中是如何“湊”十的呢，我們看以下例題：在計算13減4時，先考慮個位3減4，不夠減，從十位借10來減，10減4得6，然后用6與個位數(shù)3相加等于9； (2)、借十法 口訣 (3)、掌握借十法 湊 十 歌 一九一九好朋友； 二八二八手拉手； 三七三七真親密； 四六四六一起走； 五五湊成一雙手。 一加九,十只小蝌蚪, 二加八,十只花老鴨, 三加七,十只老母雞, 四加六,十只金絲猴, 五加五,十只大老虎。 看到9想到1, 看到8想到2, 看到7想到3, 看到6想到4。 看到大數(shù)加小數(shù),。 三、練習題(1)、練 習 題 一 （湊 十 法）9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 9 + 7 =9 + 8 = 9 + 9 = 8 + 8 =8 + 7 = 8 + 9 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 =7 + 9 = 7 + 8 = 7 + 7 =7 + 6 = 7 + 4 = 7 + 5 =6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 5 + 8 = 5 + 7 = 5 + 6 =4 + 9 = 4 + 8 = 4 + 7 =3 + 9 = 3 + 8 = 2 + 9 =(2)、練 習 題二 （破十法）18 9 = 17 9 = 16 9 = 15 9 = 11 4= 14 9 = 13 9 = 12 9 = 11 9 = 12 3 = 17 8 = 16 8 = 15 8 = 14 8 = 11 3 = 13 8 = 12 8 = 11 8 = 16 7 = 11 2 = 15 7 = 14 7 = 13 7 = 12 7 = 11 5 = 11 7 = 15 6 = 14 6 = 13 6 = 12 4= 12 6 = 11 6 = 14 5 = 13 5 = 13 4= (3)、 練 習 題. 三 （20以內退位減法）15 6 = 12 5 = 17 9 = 13 4 = 11 5 = 14 7 = 16 8 = 15 9 = 18 9 = 12 7 = 14 9 = 13 7 = 12 9 = 11 3 = 12 4 =16 9 = 15 8 = 13 8 =11 6 = 13 4 = 14 5 =13 9 = 17 8 = 14 6=(4)、練 習 題. 四 （湊十法） 9 + 9 = 9 + 8 = 9 + 7 =9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 8 + 8 =8 + 7 = 8 + 6 = 8 + 5 =8 + 4 = 8 + 3 = 7 + 7 =7 + 6 = 7 + 5 = 7 + 4 =6 + 6 = 6 + 5 = (5)、練 習 題. 五 9 + 9 = 8 + 9 = 7 + 9 =6 + 9 = 5 + 9 = 4 + 9 =3 + 9 = 2 + 9 = 8 + 8 =7 + 8 = 6 + 8 = 5 + 8 =4 + 8 = 3 + 8 = 7 + 7 =6 + 7 = 5 + 7 = 4 + 7 =6 + 6 = 5 + 6 = (6)、練 習 題. 六 9 + 5 =9 + 7 =7 + 4 =8 + 5 =5 + 9 =7 + 7 =5 + 8 =7 + 6 =6 + 8 =7 + 5 =5 + 7 =6 + 6 =6 + 9 =6 + 5 =5 + 6 =(7)、 練 習 題. 七 8 + 6 =9 + 5 =5 + 7 =7 + 6 =8 + 7 =5 + 9 =6 + 7 =5 + 7 =5 + 6 =7 + 8 =4 + 7 =5 + 6 =7 + 9 =9 + 5 =9 + 4 =15 - 6 = 14 - 5 = 13 - 4 =12 - 3 = 11 - 2 = 16 - 7 =17 - 8 = 18 - 9 = 16 - 8 =15 - 7 = 17 - 9 = 14 - 6 =13 - 5 = 12 - 4 = 11 - 3 =16 - 9 = 15 - 8 = 14 - 7 =13 - 6 = 11 - 4 = 12 - 5 =15 - 9 = 14 - 8 = 13 - 7 =12 - 6 = 11 - 5 = 14 - 9 = 13 - 8 = 12 - 7 = 11 - 6 =13 - 9 = 12 - 8 = 11 - 7 =12 - 9 = 11 - 8 = 11 - 9 =9 + 8 = 9 + 7 = 9 + 6 =9 + 5 = 9 + 4 = 9 + 3 =9 + 2 = 8 + 7 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 =7 + 6 = 7 + 5 = 7 + 4 =6 + 5 = （8）、 練 習 題八 8 + 9 = 7 + 9 = 6 + 9 =5 + 9 = 4 + 9 = 3 + 9 =2 + 9 = 7 + 8 = 6 + 8 =5 + 8 = 4 + 8 = 3 + 8 =6 + 7 = 5 + 7 = 4 + 7 =5 + 6 = 3.9 + 9 = 8 + 8 = 7 + 7 = 6 + 6 = 9 + 9 = 9 + 8 = 9 + 7 =9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 8 + 8 =8 + 7 = 8 + 6 = 8 + 5 =8 + 4 = 8 + 3 = 7 + 7 =7 + 6 = 7 + 5 = 7 + 4 =6 + 6 = 6 + 5 = 9 + 9 = 8 + 9 = 7 + 9 =6 + 9 = 5 + 9 = 4 + 9 =3 + 9 = 2 + 9 = 8 + 8 =7 + 8 = 6 + 8 = 5 + 8 =4 + 8 = 3 + 8 = 7 + 7 =6 + 7 = 5 + 7 = 4 + 7 =6 + 6 = 5 + 6 = 9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 9 + 7 = 9 + 8 = 9 + 9 =8 + 8 = 8 + 7 = 8 + 9 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 = 7 + 9 =7 + 8 = 7 + 7 = 7 + 6 = 7 + 4 =7 + 5 = 6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 5 + 8 = 5 + 7 = 5 + 6 = 4 + 9 = 4 + 8 =4 + 7 = 3 + 9 = 3 + 8 = 2 + 9 = 15 6 = 12 5 = 17 9 = 13 4 = 11 5 = 14 7 = 16 8 = 15 9 = 18 9 = 12 7 = 14 9 = 13 7 = 12 9 = 11 3 = 12 4 = 16 9 =15 8 = 13 8 = 11 6 = 13 4 = 14 5 = 13 9 = 17 8 = 14 6= 14 - 6 =17 - 9 =16 - 8 =11- 8 =12 - 7 =12 - 5 =13- 7 =13 - 8 =14 - 9 =15- 7 =13 - 5 =18 - 9 =11 - 7 =17- 8 =19 - 7 = （9）、練 習 題九 9 + 6 = 9 + 5 = 9 + 4 =9 + 3 = 9 + 2 = 9 + 7 =9 + 8 = 9 + 9 = 8 + 8 =8 + 7 = 8 + 9 = 8 + 6 =8 + 5 = 8 + 4 = 8 + 3 =7 + 9 = 7 + 8 = 7 + 7 =7 + 6 = 7 + 4 = 7 + 5 =6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 5 + 8 = 5 + 7 = 5 + 6 =4 + 9 = 4 + 8 = 4 + 7 =3 + 9 = 3 + 8 = 2 + 9 = 9 + 6 = 9 + 5 = 9 + 4 = 9 + 3 =9 + 2 = 9 + 7 = 9 + 8 = 9 + 9 =8 + 8 = 8 + 7 = 8 + 9 = 8 + 6 =15 6 = 12 5 = 17 9 = 13 4 = 11 5 = 14 7 = 16 8 = 15 9 = 18 9 = 12 7 = 14 9 = 13 7 = 12 9 = 11 3 = 12 4 = 16 9 =15 8 = 13 8 = 11 6 = 13 4 = 14 5 = 13 9 = 17 8 = 14 6= 8 + 5 = 8 + 4 = 8 + 3 =7 + 9 = 7 + 8 = 7 + 7 =7 + 6 = 7 + 4 = 7 + 5 =6 + 9 = 6 + 8 = 6 + 7 =6 + 6 = 6 + 5 = 5 + 9 = 15 6 = 12 5 = 17 9 = 13 4 = 11 5 = 14 7 = 16 8 = 15 9 = 18 9 = 12 7 = 14 9 = 13 7 = 12 9 = 11 3 = 12 4 =16 9 = 15 8 = 13 8 =11 6 = 13 4 = 14 5 =13 9 = 17 8 = 14 6= (10)、練 習 題十 20以內退位減法破十法、湊十法復習例子：9 + 9 = 9 + 8 = 9 + 7 =鞏固練習：7 + 9 = 7 + 8 = 7 + 7 =9 + 9 = 9 + 8 = 9 + 7 = 18 9 = 17 9 = 16 9 = 15 9 = 鞏固練習：17 8 = 16 8 = 15 8 = 14 8 = 13 8 = 12 8 = 11 8 = 16 7 = 12 6 = 11 6 = 14 5 = 13 5 = 6 + 9 = 6 + 8 = 6 + 7 = 3 + 9 = 7 + 8 = 9 + 7 =一、 判斷里的數(shù)對不對？對的畫“”，錯的畫“”。（ ）（ ）（ ）（ ）（