20以内的进位加法
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20以内进位加减法20以内进位加法:方法一:“凑十法”(强调:看大数,分小数,凑成十,加剩数)8+5=8+2+3=13;方法二:“五五凑十”( 当两个加数都大于且接近5时适用) 6+7=5+5+1+2=13;方法三:“多加减补”8+5=10+5-2=13.20以内进位加法“凑十法”、“凑小数,拆大数”,将小数凑成10,然后再计算。
如: 3+9 (3+7=10,9可以分成7和2,10+2=12)凑大数,拆小数”,将大数凑成10,然后再计算。
如: 8+7 (8+2=10,7可以分成2和5,10+5=15)整数加法计算法则:相同数位对齐,从低位加起,哪-一位上的数相加满十,就向前一位进一。
整数减法计算法则:相同数位对齐,从低位加起,哪一位上的数不够减,就从它的前一位退一作十,和本位上的数合并在一起,再减。
例题加减混合运算2+6+2= 5+3+2= 4+0+3= 10—3—7= 9—3—6= 10—1—4= 7—2+4= 8+2—6= 10—4+3= 3+6—8= 一、10以内的加减法0+6=0+0=1+2=1+9=10-8=2+3=2+8=4--3=3+6=5-1=6-4=4+6=9-0=5+5=6+2=7+2=7+3=8+1=9-2=9-7=8-1=8-5=8-7=7-3=7-5=3+1=5-4=3+3=3-1=4+4=二、求未知加数2+()=10 4+()=8 5+()=109+()=9 3+()=7 ()+6=10 ()+3=9 ()+1=10 ()+7=10 ()+9=10三、连加17-10= 16-1= 16-2= 16-3= 16-4=1+11= 1+12= 1+13= 1+14= 1+15=20-10= 19-1= 19-2= 19-3= 19-4=18-5= 18-6= 18-7= 18-8= 18-9=17-5= 17-6= 17-7= 17-8= 17-9=6-2= 6-3= 6-4= 6-5= 6-6=16-10= 15-1= 15-2= 15-3= 15-4=15-10= 14-1= 14-2= 14-3= 14-4= 1+16= 1+17= 1+18= 1+19= 2+0= 19-5= 19-6= 19-7= 19-8= 19-9=2+12= 2+13= 2+14= 2+15= 2+16= 15-5= 15-6= 15-7= 15-8= 15-9= 18-10= 17-1= 17-2= 17-3= 17-4= 2+17= 2+18= 3+3= 3+4= 3+5= 19-10= 18-1= 18-2= 18-3= 18-4= 3+16= 3+17= 4+4= 4+5= 4+6=13-5= 13-6= 13-7= 13-8= 13-9=13-10= 12-1= 12-2= 12-4= 12-5= 4+12= 4+13= 4+14= 4+15= 4+16= 11-1= 11-2= 11-3= 11-4= 11-5=5+5= 5+6= 5+7= 5+8= 5+9=8-7= 8-8= 7-1= 7-2= 7-3=。
20以内进位加法解读一、引言进位加法是我们日常生活中经常使用的一种加法运算方法。
本文将详细介绍20以内的进位加法,并解读其中的原理和应用。
二、什么是进位加法?进位加法是指在两个或多个数相加的过程中,当相加的两位数(或更多位数)的和大于等于进制规定的进位值时,需要将进位值加到前一位上,并将当前位的和取余(模)进制规定的数,形成新的位数的加法运算。
在20进制下,当相加的两位数之和大于等于20时,需要进行进位操作。
三、进位加法的原理进位加法的原理可以通过以下步骤来理解:1.从最低位开始,将相应位的数相加。
2.如果和小于20,则直接写下该和,并进入下一位数相加。
3.如果和大于等于20,则需要进行进位操作:将该位的和减去20,并记录进位值为1。
4.将进位值加到前一位数上,并继续下一位数相加。
5.重复以上步骤,直至所有位数相加完毕。
四、进位加法的计算步骤示例下面通过一个具体的例子来演示20以内的进位加法的计算步骤:假设我们需要计算以下两个数的和:13+81.从最低位开始相加:3+8=11。
2.由于和大于等于20,需要进行进位操作:11-20=11(本位的和减去20),并记录进位值为1。
3.进位值1加到前一位数上:1+1=2(十位的和)。
4.最终结果为2(十位的和)1(个位的和),即21。
五、进位加法的应用场景进位加法广泛应用于日常生活中。
以下是一些常见的应用场景:1.购物结算:当我们购买多件商品时,需要将每件商品的价格相加,进位加法可用于计算总价格。
2.时间计算:当我们计算时间差或者时间相加时,可以使用进位加法来处理小时、分钟和秒的进位情况。
3.学习成绩计算:当我们计算多门学科的成绩总和时,进位加法可用于计算总分数。
通过以上几个应用场景的解读,可以看出进位加法在我们生活中的普遍性和重要性。
六、总结进位加法是一种常用的加法运算方法,尤其在20以内的计算中更加常见。
本文介绍了进位加法的原理、计算步骤示例以及几个常见的应用场景。
姓名: 时间: 成绩:创作编号:GB8878185555334563BT9125XW创作者: 凤呜大王*8+8=7+9=7+8=6+7=6+7=7+5=7+7=8+8=2+9=7+7= 4+7= 3+9= 6+6= 6+8= 8+3=9+3=3+8=9+2=2+9=8+8=4+9=9+8=7+9=7+7=9+9= 8+8=4+8= 8+5= 9+5= 8+5= 6+5= 7+7= 9+5= 3+8= 8+4= 9+6= 4+9= 8+4= 5+7=6+7= 8+9= 9+2=6+9=9+9= 6+6= 9+9=7+7= 3+8= 9+2= 6+5= 7+9= 2+9= 7+7= 4+8= 8+3= 8+6=作编号:GB8878185555334563BT9125XW作者: 凤呜大王*6+7= 5+6= 5+6= 8+5= 6+5= 9+6= 4+8=姓名:时间:成绩:7+7=9+5=7+8=7+5=9+9=5+7=8+4=8+4=9+3=9+6=4+8=8+5=7+8=9+7=3+8=4+8=9+2=3+9=4+7=9+4=7+9=9+2=4+9=4+8=7+9=9+8=6+8=5+7=4+7=9+7=8+3=7+4=5+6=9+9=7+9=3+8=8+5=8+3=9+9=9+9=9+7=3+8=9+2=7+5=4+8=4+7=5+9=4+8=8+6=6+6=5+9=6+8=4+9=9+9=6+5=8+4=9+4=3+9=5+8=作编号:GB8878185555334563BT9125XW作者:凤呜大王*5+9=9+2=7+6=7+5=8+3=9+9=5+7=6+7=6+6=8+4=姓名:时间:成绩:5+8=3+8=6+6=6+6=7+6=2+9=7+6=5+7=6+8=8+8=6+7=6+7=2+9=6+8=8+4=8+4=7+9=2+9=6+9=6+9=7+7=7+8=9+8=8+4=6+5=9+3=9+2=6+7=8+9=9+8=4+8=9+9=7+9=5+7=8+3=9+2=8+6=9+2=7+7=8+7=3+9=7+6=9+6=8+9=5+7=8+9=9+7=8+6=7+5=7+7=2+9=9+7=4+8=8+5=5+8=9+7=6+5=6+9=6+9=8+7=9+6=9+4=6+9=4+7=3+9=5+7=作编号:GB8878185555334563BT9125XW作者:凤呜大王*7+8=7+9=9+2=姓名:时间:成绩:9+5=9+8=2+9=4+7=9+9=4+9=8+8=8+7=8+6=8+7=8+7=9+9=6+6=7+4=9+3=3+9=9+3=9+5=6+8=7+6=6+9=8+3=6+5=8+3=8+4=4+7=7+6=5+8=8+8=7+5=7+9=3+8=8+6=8+5=9+6=6+6=5+9=7+6=7+8=9+8=8+3=7+4=8+4=6+5=8+4=6+5=6+8=4+9=3+8=4+7=8+7=9+9=6+5=7+9=4+8=9+2=5+9=6+6=3+8=9+6=9+8=6+9=3+8=9+7=5+7=9+3=9+6=7+9=9+9=8+5=7+5=9+2=6+6=6+8=7+8=姓名: 时间: 成绩:3+9= 5+6= 9+7= 2+9= 6+7= 7+8= 9+8= 7+9=创作编号:GB8878185555334563BT9125XW创作者: 凤呜大王*9+2= 8+9= 4+7= 5+6= 9+2= 7+4= 7+5= 5+7= 3+8= 7+6= 9+7= 9+2= 5+9= 8+5= 7+7=6+7= 5+6= 3+8= 6+5= 2+9= 5+8= 4+8= 8+3= 2+9= 6+6= 6+9= 6+7= 8+7=6+5= 5+6= 9+8=9+2= 8+8= 2+9= 7+9= 4+7= 9+2= 8+5= 3+8= 8+9= 8+7= 8+5= 7+4= 5+9=8+4= 5+9=6+6= 5+7= 8+9= 4+7= 8+5= 9+2= 8+7= 7+9= 6+8= 4+8= 7+4= 6+6= 3+9= 5+6= 9+7=姓名:时间:成绩:8+4=6+5=6+5=9+5=9+8=8+3=8+3=9+6=7+9=7+5=6+8=7+7=8+4=9+2=3+8=5+8=8+7=6+6=8+9=8+6=7+4=5+9=9+2=9+4=6+6=5+6=6+7=9+3=3+9=5+7=9+2=6+6=3+9=9+3=8+7=创作编号:GB8878185555334563BT9125XW创作者:凤呜大王*7+8=3+8=8+5=8+8=5+8=8+5=5+7=9+9=9+3=8+3=6+9=9+9=5+6=7+5=6+6=3+8=3+8=8+7=6+6=6+7=5+8=8+3=3+8=5+7=7+7=9+5=4+8=9+7=9+4=8+6=4+7=6+8=8+8=9+9=姓名:时间:成绩:9+9=8+5=9+7=6+9=8+6=3+8=8+3=5+7=9+3=4+8=8+6=8+9=8+9=8+3=9+8=8+5=4+8=4+8=7+8=6+7=6+5=9+8=8+4=4+7=8+4=7+7=9+4=3+8=7+8=9+6=6+8=7+8=4+8=8+9=6+5=9+9=4+9=2+9=8+4=9+6=5+8=8+9=7+7=7+5=9+7=4+8=5+8=6+8=7+9=4+9=9+3=2+9=5+6=8+4=9+9=6+7=9+2=5+7=9+7=6+6=8+4=9+6=7+4=6+9=6+9=9+2=3+8=7+5=2+9=8+7=7+8=6+8=作编号:GB887818555姓名: 时间: 成绩:5334563BT9125XW创作者: 凤呜大王*6+9= 7+8= 9+5= 9+4= 5+8= 3+9= 8+4= 8+9= 7+8= 9+8= 8+8= 9+5=7+5= 8+4= 8+4=5+8= 6+5= 8+9= 9+4= 3+9= 8+8= 8+5= 8+5= 4+7= 7+8= 9+9= 7+5=9+2= 8+4= 5+8= 9+2= 8+3= 3+8= 6+7= 4+8= 4+8= 4+8= 9+8= 9+2= 8+6= 3+8= 9+7=6+9= 7+6= 8+9= 5+7= 6+7= 9+2= 3+8= 9+9= 3+9= 6+5= 7+8= 3+8= 7+4= 6+7= 3+9=8+9= 9+7= 4+8= 7+9= 9+5= 9+8= 8+7= 8+9= 7+9= 4+9= 7+6= 9+8= 6+7= 4+9= 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