1、十几减8、7、6练习,新人教版数学一年级下册,基础练习,127=,118=,136=,157=,189=,167=,7 + 5=,178=,146=,8 + 9=,116=,159=,5,3,7,8,9,9,12,9,8,17,5,7,157=8,189=9,116=5,个位不够减，要用退位减；个位能够减，不用退位减。,11 9 =,12 9 =,13 9 =,14 9 =,15 9 =,16 9 =,17 9 =,18 9 =,你发现了什么？,2,3,4,5,6,7,8,9,11 9 = 2 12 9 = 3 13 9 = 4 14 9 = 5 15 9 = 6 16 9 = 7 17 9
2、= 8 18 9 = 9,。,十几减9，是几加1,11 8 =,12 8 =,13 8 =,14 8 =,15 8 =,16 8 =,17 8 =,你发现了什么？,3,4,5,6,7,8,9,11 8 = 3 12 8 = 4 13 8 = 5 14 8 = 6 15 8 = 7 16 8 = 8,。,十几减8，是几加2,11 7 =,12 7 =,13 7 =,14 7 =,15 7 =,16 7 =,你发现了什么？,4,5,6,7,8,9,11 7 = 4 12 7 = 5 13 7 = 6 14 7 = 7 15 7 = 8 16 7 = 9,。,十几减7，是几加3,11 8 =,13
3、7 =,13 6 =,18 9 =,15 8 =,17 9 =,11 7 =,14 6 =,3,6,7,9,7,8,4,8,15 9 =,12 7 =,13 9 =,15 7 =,11 6 =,16 9 =,17 8 =,14 8 =,6,5,4,8,5,7,9,6,破十法儿歌,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.,减九想一,11-9，见减数9想1,1加上被减数个位上的1得2，所以11-9=2,减八想二,11-8，见减数8想2,2加上被减数个位上的1得3，所以11-8=3,减七想三,11-7，见减数7想3,
4、3加上被减数个位上的1得4，所以11-7=4,减六想四,11-6，见减数6想4,4加上被减数个位上的1得5，所以11-6=5,书本P15.3,138=5,158=7,168=8,128=4,118=3,148=6,178=9,108=2,127=5,147=7,167=9,137=6,117=4,157=8,116=5,156=9,146=8,166=10,136=7,138=5,158=7,168=8,128=4,118=3,148=6,178=9,108=2,127=5,147=7,167=9,137=6,117=4,157=8,116=5,156=9,146=8,166=10,136=7,加油！加油！,2,5,8,11,3,9,4,6,10,7,书本P15.2,我会算！,7,12,15,7,9,2,6,14,14,18,4,13,书本P16.7,5,8,9,11-6=5,15-7=8,18-9=9,6,12,-,6,6,一个数加上7，它的得数比15小比11大，请问这个数是几？,我最聪明,( ) + 7 15,11,12,13,14,( ) + 7 =12,( ) + 7 =13,( ) + 7 =14,6,5,7,换奖品,儿童时代,8分换一本,两次得分够换一本吗？,还多几分？,6+7=13（分）,13-8=5（分）,答：两次得分够换一本，还多5分。,
