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① 相同数位对齐；

① 相同数位对齐；. ② 从个位加起；. ③ 哪一位上的数相加满十，要向前一位进 1 ．. 6 + 8 + 2= 5 + 7 + 9= 3 + 7 + 5= 6 + 7 + 4= 1 + 4 + 9= 3 + 5 + 5= 4 + 8 + 6= 8 + 9 + 2=. 8 + 7= 7 + 6= 5 + 8= 4 + 6= 9 + 5= 7 + 5= 3 + 8= 4 + 7=. 连 加. 88 + 97 + 105 =. ① 相同数位对齐；. ② 从个位加起；. 88 + 97 + 105 =. 290 （千克）.

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① 相同数位对齐；

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  1. ①相同数位对齐； ②从个位加起； ③哪一位上的数相加满十，要向前一位进1．

  2. 6 + 8 + 2=5 + 7 + 9= 3 + 7 + 5= 6 + 7 + 4= 1 + 4 + 9= 3 + 5 + 5= 4 + 8 + 6=8 + 9 + 2= 8 + 7= 7 + 6= 5 + 8= 4 + 6= 9 + 5= 7 + 5= 3 + 8= 4 + 7=

  3. 连 加

  4. 88 + 97 + 105 =

  5. ①相同数位对齐； ②从个位加起； 88 + 97 + 105 = 290（千克） 8 8 9 7 + 1 0 5 1 2 2 9 0 ③哪一位上的数相加满（几）十，要向前一位进几．

  6. 702 ＋ 2984 ＋ 368 ＝ 4054 7 0 2 2 9 8 4 + 3 6 8 2 1 1 4 4 0 5

  7. 1．先想一想怎样算简便，再口算 6+4+7= 8+9+2=7+5+5= 15+3+5= 9+7+1= 23+9+7= 2．做一做

  8. 3．练一练 4．笔算下面各题 48 + 159 + 66 = 653 + 2185 + 924 = 247 + 968 + 8293 =

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