1、3( )19,( )869,5( )17,( )750,6,3,8,7,最大填几?,39=,46+3=,210+7=,55+2=,27,27,27,27,口算,2,3,4,6,7,8,9,10,11,1,5,小亚有11只桃子,帮她分一分,说说几个一份? 还多几个?,11=111,2,3,4,6,7,8,9,10,11,1,5,11=52+1,2,3,4,6,7,8,9,10,11,1,5,11=33+2,2,3,4,6,7,8,9,10,11,1,5,11=24+3,2,3,4,6,7,8,9,10,11,1,5,11=25+1,1,2,3,4,6,7,8,9,10,11,1,5,11=16+
2、5,2,3,4,6,7,8,9,10,11,1,5,11=17+4,2,3,4,6,7,8,9,10,11,1,5,11=18+3,2,3,4,6,7,8,9,10,11,1,5,11=19+2,2,3,4,6,7,8,9,10,11,1,5,11=110+1,2,3,4,6,7,8,9,10,11,1,5,11=111,2,3,4,6,7,8,9,10,11,1,5,11=11111= 52 +111= 33 +111= 24 +311= 25 +111= 16 +511= 17 +411= 18 +311= 19 +2 11= 110 +1 11= 111,2,3,4,6,7,8,9,10
3、,11,1,5,分拆为乘与加,书上58页,分拆21。,21=210+1,21=45+1,21=( )2+1,21=( )4+( ),21=( )8+( ),21=( )7,21=( )3,21=( )6+( ),21=( )9+( ),10,7,5,1,3,3,3,2,5,2,3,填空,22=( )4+( )36=( )7+( )50=( )6+( )44=( )9+( ),5,2,5,1,8,2,4,8,判断&应用,小胖这样想:23=35+8,所以23元最多能买3张票。,在剩余的8元中还能买一张票,x,小胖和同学们来到公园玩碰碰车,他们现在有23元活动费,每张票要5元。他们最多能买几张票?,23=45+3,答:他们最多能买4张票。,火柴盒里有38根火柴,小丁丁用它们搭下列漂亮的图案。,能搭多少个正方形?,38=94+2 答:能搭9个正方形。,拓展,想一个数,写一写能分拆成多少种乘与加!,