六年级上册天天练口算答案?6,5.8,5.77 2,2.5,2.49 1,0.5,0.52 0.01,1 10,0.1 10,10000 100,100000 100 0.999 0.001,那么,六年级上册天天练口算答案?一起来了解一下吧。
口算速算天天练六年级上答案51 45 65 48 75 15 1.5 48.2 561.57 4.6 546 25... -02-13 兰州大学出版社新课标人教版六年级上册口算速算天天练答案 8...
一、十位数是1的两个两位数乘法
一个数与另一个数的个位之和(扩10倍),加上两个个位乘积。
例题:17 × 18 = ?
方法:
(17 + 8)×10 = 250
+ 7 × 8 = 56
——————————
306
答案:17 × 18 = 306
解释:
17 × 18
= 17 ×(10 + 8)
= 17 × 10 + 17 × 8
= 170 +(10 + 7)× 8
= 170 + 80 + 7 × 8
=(170 + 80)+(7 × 8)
= 250 + 56
= 306
验算:
17
×18
——————
136
+17
——————
306
再例:18 × 19 = ?
方法:
(18 + 9)×10 = 270
+ 8 × 9 =72
———————————
342
答案:18 × 19 = 342
练习题:
11 × 11 = ?12 × 12 = ?13 × 13 = ?
11 × 12 = ?12 × 13 = ?13 × 14 = ?
11 × 13 = ?12 × 14 = ?13 × 15 = ?
11 × 14 = ?12 × 15 = ?13 × 16 = ?
11 × 15 = ?12 × 16 = ?13 × 17 = ?
11 × 16 = ?12 × 17 = ?13 × 18 = ?
11 × 17 = ?12 × 18 = ?13 × 19 = ?
11 × 18 = ?12 × 19 = ?
11 × 19 = ?
14 × 14 = ?15 × 15 = ?16 × 16 = ?
14 × 15 = ?15 × 16 = ?16 × 17 = ?
14 × 16 = ?15 × 17 = ?16 × 18 = ?
14 × 17 = ?15 × 18 = ?16 × 19 = ?
14 × 18 = ?15 × 19 = ?
14 × 19 = ?
17 × 17 = ?18 × 18 = ?19 × 19 = ?
17 × 18 = ?18 × 19 = ?
17 × 19 = ?
二、十位数为1两位数的平方
速算法:底数与其个位之和,加上底数个位平方。
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5 4 54 322 r4 54 23 23 1234 2423 23.4 343.5 531274.r44
400÷4= 100
350-80= 270
160+70=230
18-64÷8= 10
42÷6+20=27
40-5×7= 5
80+60÷3=100
41+18÷2= 50
75-11×5= 20
42+7-29= 20
5600÷80=70
.25×16= 400
.120×25= 3000
.36×11= 396
1025÷25=41
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