北京課改版一年級(jí)上冊(cè)數(shù)學(xué) 9.4 探索規(guī)律 教學(xué)課件

1、情境導(dǎo)入 5+7= 11-6= 12-7= 7+9= 13-6= 16-9= 17-8= 15-7=1257951678口算情境導(dǎo)入987654321+123456789想一想，你會(huì)填這個(gè)表嗎？探究新知910111213141516171889101112131415161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789探究新知91011121314151617188910111213141516177891011121314

2、1516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789.把圖中橫排和豎列上兩個(gè)數(shù)相加等于9的格子涂成紅色,你能發(fā)現(xiàn)什么規(guī)律?910111213141516171889101112131415161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789探究新知兩數(shù)相加得數(shù)是9的格子排列得像階梯,一格比

3、一格向右向下移一格。910111213141516171889101112131415161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789探究新知從左上方往右下方斜著看,得數(shù)是9的格子像一條直直的線。探究新知用不同顏色把兩個(gè)數(shù)相加的和分別是8,7,6的格子涂出來(lái),看一看有什么規(guī)律。9101112131415161718891011121314151617789101112131415166789101112131415567

4、89101112131445678910111213345678910111223456789101112345678910+123456789探究新知.910111213141516171889101112131415161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789每一列中兩數(shù)相加的和從上往下依次減少1,每一行中兩數(shù)相加的和從左往右依次增加1。探究新知.910111213141516171889101112131415

5、161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789從左上方往右下方斜著看,相鄰的兩行得數(shù)相差1。探究新知出現(xiàn)次數(shù)最多的和是幾?出現(xiàn)次數(shù)最少的和是幾?910111213141516171889101112131415161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123

6、456789探究新知910111213141516171889101112131415161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789出現(xiàn)次數(shù)最多的和是10,出現(xiàn)次數(shù)最少的和是2和18。91011121314151617188910111213141516177891011121314151667891011121314155678910111213144567891011121334567891011122345678

7、9101112345678910+123456789探究新知從左下方往右上方斜著看,你發(fā)現(xiàn)了什么?910111213141516171889101112131415161778910111213141516678910111213141556789101112131445678910111213345678910111223456789101112345678910+123456789探究新知從左下方往右上方斜著看,可以發(fā)現(xiàn)相鄰的兩個(gè)得數(shù)相差2。課堂練習(xí)98765+5678910101112131415141312111615141317121618131415161715141718191615填一填 找規(guī)律課堂練習(xí)98765+5678910101112131415141312111615141317121618131415161715141718191615填一填 找規(guī)律斜著看,得數(shù)相同的格子成一條直線。課堂練習(xí)98765+567891010111213141514131211161514131712161813141