四年级数学下册简便计算题1000道
四年级数学下册简便计算题1000道
329×101
=329×100+329×1
=32900+329
=33229
9 × 37+9 ×63
=9×(37+63)
=9×100
=900
25 ×(20 + 4)
=25×20+25×4
=500+100
=600
45 × 7 + 55 × 7
=(45+55)×7
=100×7
=700
8 × 27 + 8 × 73
=8×(27+73)
=8×100
=800
504x25
=500×25+4×25
=12500+100
=12600
36×97-58×36+61×36
=36×(97-58+61)
=36×100
=3600
5000÷8÷125
=5000÷(8×125)
=5000÷1000
=5
25x(4+8)
=25×4+25×8
=100+200
=300
84x101
=84×100+84×1
=8400+84
=8484
四年级数学下册简便计算题
?要题目呢 还是、、、、
四年级数学下册简便计算
可以用650来除以25乘2的积 也就是650除以50等于13
也可以先用650除以25等于26 在用26除以2等于13
望楼主采纳谢谢!
四年级数学下册简便计算题加答案 横式计算 速度求
1. 67 ×21 +18 ×21 + 85 ×79
2. 375 ×480 + 6250 ×48
3. 321 ×81 + 321 ×19
4. 222222 ×999999
5. 333333 ×333333
6. 654321 ×909090 +654321 ×90909
7. 34 ×3535 -35 ×3434
8. 345345 ÷15015
9. 75 ×45 + 17 ×25
10. (48 ×75 ×81)÷(24 ×25 ×27)
【答案详解】
1. 67 ×21 +18 ×21 + 85 ×79
=21×(67+18)+85×79
=21×85+85×79
=85×(21+79)
=8500
2. 375 ×480 + 6250 ×48
=480×(375+625)小学四年级数学下册
=480000
3. 321 ×81 + 321 ×19
=321×(81+19)
=32100
4. 222222 ×999999
=222222×(1000000-1)
=222222000000-222222
=222221777778
5. 333333 ×333333
=111111×999999
=111111×(1000000-1)
=111111000000-111111
=111110888889
6. 654321 ×909090 +654321×90909
=654321×999999
=654321×(100000-1)
=654321000000-654321
=654320345679
7. 34 ×3535 -35 ×3434
=34×35×101-35×34×101
=0
8. 345345 ÷15015
=345×1001÷(15×1001)
=345÷15×1001÷1001
=23
9. 75 ×45 + 17 ×25
=25×3×45+17×25
=25×(135+17)
=25×152
=25×4×38
=3800
10. (48 ×75 ×81)÷(24 ×25 ×27)
=48÷24×75÷25×81÷27
=2×3×3
=18
希望能帮到你,望采纳,谢谢!
四年级数学简便计算题
类型一(减法性质)
公式:a-b-c = a-(b+c)
题目:
10-0.432 -2.568
9.3-5.26-2.74
13.4-(3.4+5.2)
14.9-(5.2+4.9)
18.32-5.47-4.32
17.29-5.28-6.29
类型二(乘法结合律
公式:(aXb)Xc=aX(bXc)
题目:
25×6.8×0.04
0.25×32×0.125
6.4×1.25×12.5
类型三(乘法分配律)
公式:c×(a+b)=ca+cb
题目:
0.45×201
0.58×10.1
50.2×99
4.7×9.9
3.28X5.7+6.72X5.7
2.1×99+2.1
1.7×9.9+0.17
23×0.1+2.3×9.9
0.18+4.26-0.18+4.26
0.58X1.3÷0.58X1.3
7.3÷4+2.7X0.25
3.75X0.5-2.75÷2
5.26X0.125+2.74÷8
类型四(除法性质)
公式:a÷b÷c=a÷(b×c)
题目:
6.3÷1.8
4.2÷3.5
9.5÷(1.9 × 8)
12.8÷(0.4×1.6)
930÷0.6÷5
63.4÷2.5÷0.4
(7.7+1.54)÷0.7
(11.7+9.9)÷0.9
另还有加法交换律、结合律,乘法交换律相比是较容易的。
1.01×99= 420÷35= 25×12= 135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17= 32.8+19= 5.2÷1.3= 1.6×0.4=
4.9×0.7= 1÷5= 6÷12= 0.87-0.49=
17×40= 100-63= 3.2+1.68= 2.8×0.4=
14-7.4= 1.92÷0.04= 0.32×500= 0.65+4.35=
10-5.4= 4÷20= 3.5×200= 1.5-0.06=
0.75÷15= 0.4×0.8= 4×0.25= 0.36+1.54=
1.01×99= 420÷35= 25×12= 135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17= 32.8+19= 5.2÷1.3= 1.6×0.4=
4.9×0.7= 1÷5= 6÷12= 0.87-0.49=
17×40= 100-63= 3.2+1.68= 2.8×0.4=
14-7.4= 1.92÷0.04= 0.32×500= 0.65+4.35=
10-5.4= 4÷20= 3.5×200= 1.5-0.06=
0.75÷15= 0.4×0.8= 4×0.25= 0.36+1.54=
1.01×99= 420÷35= 25×12= 135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17= 32.8+19= 5.2÷1.3= 1.6×0.4=
4.9×0.7= 1÷5= 6÷12= 0.87-0.49=
17×40= 100-63= 3.2+1.68= 2.8×0.4=
14-7.4= 1.92÷0.04= 0.32×500= 0.65+4.35=
10-5.4= 4÷20= 3.5×200= 1.5-0.06=
0.75÷15= 0.4×0.8= 4×0.25= 0.36+1.54=
1.01×99= 420÷35= 25×12= 135÷0.5=
3/4 + 1/4 = 2 + 4/9 = 3 - 2/3 = 3/4 - 1/2=
1/6 + 1/2 -1/6 = 7.5-(2.5+3.8)= 7/8 + 3/8 =
3/10 +1/5 = 4/5 - 7/10 = 2 - 1/6 -1/3 =
0.51÷17= 32.8+19= 5.2÷1.3= 1.6×0.4=
4.9×0.7= 1÷5= 6÷12= 0.87-0.49=
17×40= 100-63= 3.2+1.68= 2.8×0.4=