课件35张PPT。练习二11-8 =2+1 =312-8 =13-8 =14-8 =16-8 =15-8 =17-8 =2+2 =42+3 =52+4 =62+5 =72+6 =82+7 =9 十几-8=几加211-7 =3+1 =412-7 =13-7 =14-7 =16-7 =15-7 =3+2 =53+3 =63+4 =73+5 =83+6 =9 十几-7=几加311-6 =4+1 =512-6 =13-6 =14-6 =15-6 =4+3 =74+3 =74+4 =84+5 =9 十几-6=几加4 十几-9=几加111 - 9 = 212 - 9 = 313 - 9 = 414 - 9 = 515 - 9 = 616 - 9 = 717 - 9 = 818 - 9 = 9 十几-8=几加211 - 8 = 312 - 8 = 413 - 8 = 514 - 8 = 615 - 8 = 716 - 8 = 817 - 8 = 9 十几-7=几加311 - 7 = 412 - 7 = 513 - 7 = 614 - 7 = 615 - 7 = 816 - 7 = 9 儿歌 退位减,我会算
十几减9,是几加1,
十几减8,是几加2,
十几减7,是几加3,
十几减6,是几加4,
十几减5,是几加5。11 - 8 = 312 - 8 = 413 - 8 = 514 - 8 = 615 - 8 = 716 - 8 = 817 - 8 = 98 + 3 = 118 +4 = 128 + 5 = 138 + 6 = 14 8 + 7 = 158 + 8 = 168 + 9 = 17 8+几=十几减2 十几-8=几加211 - 7 = 412 - 7 = 513 - 7 = 614 - 7 = 715 - 7 = 816 - 7 = 97 + 4 = 117 +5 = 127 + 6 = 137 + 7 = 14 7 + 8 = 157 + 9 = 16 7+几=十几减3 十几-7=几加3184846688- 8 =- 7 =2357975-8-73-8-8-8-8-8-8-8-8-7-7-7-7-7-7-7-7417649 + 8 = 17 15 - 9 = 6 11 - 7 = 4 5615871798169713 – 7 = 13 – 8 = 7 + 6 =
12 – 8 = 11 – 7 = 13 – 9 =
16 – 9 = 14 – 7 = 12 – 7 =
14 – 8 = 16 – 8 = 11 – 8 = 7 在 里填“>” “<” 或“ =”
14 – 8 7
15 - 7 7
8 + 7 158<>=910