人教版数学四年级上册简便计算方法与练习汇总
展开这是一份人教版数学四年级上册简便计算方法与练习汇总,共9页。试卷主要包含了加法交换结合律,6+20,01+7,37+15,07+3,33+17,61+16,38+6等内容,欢迎下载使用。
第一种
拆成a ×( 100+1)
84x101
504x25
25x204
第二种
拆成a ×( 100-1)
99x64
99x16
638x99
第三种
a ×( b+c) =a×b+a×c
99×13+13
25+199×25
32×16+14×32
78×4+78×3+78×3
第四种
(a×b)×c= a ×( b×c)
125×32×8
25×32×125
88×125
72×125
第五种
a÷b÷c= a ÷( b×c)
a ÷( b×c) = a÷b÷c
3600÷25÷4
8100÷4÷75
3000÷125÷8
1250÷25÷5
第六种
(a+b)+c = a+(b+c)
278+463+22+37
732+580+268
1034+780320+102
425+14+186
第七种
a-b-c= a -( b+c)
a -( b+c) = a-b-c
214-(86+14)
365-(65+118)
455-(155+230) 1200-624-76
2100-728-772
847-527-273
第八种
(a-b)×c= a×c-b×c
178×101-178
83×102-83×2
17×23-23×7
35×127-35×16-11×35
1.加法交换结合律:
48+25+175 578+143+22+57 128+89+72
357+288+143 129+235+171+165
378+527+73 167+289+33
58+39+42+61 75+34+125+366
125+75+320 153+38+162
163+32+137+268 158+395+105
乘法交换结合律(一):
25 ×125×32= (15×25)×4= 38×25×4=
35×2×5= (60×25)×4= (125×5)×8=
25×17×4= 5×289×2= 125×12×12
9×8×125= 43×25×4= 125×502×8
42×125×8= 60×25×4= 125×5×8=
37×8×125= 25×17×4= 38×125×8×3=
(25×125)×(8×4)= (25×125)×(8×4)=
四年级数学简便计算题及答案:
1)125 ×(17 × 8)× 4
= 125×8×4×17
=1000×68
=68000
2)375 × 480 + 6250 × 48
=480×(375+625)
=480000
3)25 × 16 ×125
=25×2×8×125
=50000
4)13 × 99
=13×(100-1)
=1300-13
=1287
5)75000 ÷ 125 ÷ 15
=75×1000÷125÷15
=75÷15×1000÷125
=5×8
=40
6)7900 ÷ 4 ÷ 25
=7900÷(4×25)
=79
7)150 × 40 ÷ 50
=150÷50×40
=3×40
=120
8)5600 ÷(25 ×7)
=56×100÷25÷7
=56÷7×100÷25
=32
9)210 ÷ 42 × 6
=210÷7÷6×6
=30
10)39600 ÷ 25
=396×100÷25
=396×4
=1584
11)67 × 21 +18 × 21 + 85 × 79
=21×(67+18)+85×79
=21×85+85×79
=85×(21+79)
=8500
12)321 × 81 + 321 × 19
=321×(81+19)
=32100
13)222222 × 999999
=222222×(1000000-1)
=222222000000-222222
=222221777778
14)333333 × 333333
=111111×999999
=111111×(1000000-1)
=111111000000-111111
=111110888889
15)56000 ÷ (14000 ÷ 16)
=56000÷14000×16
=4×16
=64
16)654321 × 909090 +654321×90909
=654321×999999
=654321×(100000-1)
=654321000000-654321
=654320345679
17)34 × 3535 -35 × 3434
=34×35×101-35×34×101
=0
18)27000 ÷ 125
=27×1000÷125
=27×8
=216
19)345345 ÷ 15015
=345×1001÷(15×1001)
=345÷15×1001÷1001
=23
20)347 + 358 + 352 + 349
=350×4-3+8+2-1
=1400+6
=1406
21)75 × 45 + 17 × 25
=25×3×45+17×25
=25×(135+17)
=25×152
=25×4×38
=3800
22) 599996 + 49997 + 3998 + 407 + 89
=600000+50000+4000-4-3-2+407+89
=65400+487
=65887
23)(48 × 75 ×81)÷(24 × 25 × 27)
=48 × 75 ×81÷24÷25÷27
=48÷24×75÷25×81÷27
=2×3×3
=18
1)125 ×(17 × 8)× 4
2)375 × 480 + 6250 × 48
3)25 × 16 ×125
4)13 × 99
5)75000 ÷ 125 ÷ 15
6)7900 ÷ 4 ÷ 25
7)150 × 40 ÷ 50
8)5600 ÷(25 × 7)
9)210 ÷ 42 × 6
10)39600 ÷ 25
11)67 × 21 +18 × 21 + 85 × 79
12)321 × 81 + 321 × 19
13)347 + 358 + 352 + 349
586-(193+386) =
872-(198+572) =
231-(131+27) =
644-(146+444) =
627-(327+98) =
469-(169+215) =
794-(594+109) =
836-(139+636) =
500-(67+200) =
257-(22+57) =
282-(82+98) =
291-(62+191) =
180-(71+80) =
470-(270+156) =
321-(121+17) =
647-(258+347) =
573-(373+128) =
349-(149+99) =
486-(186+39) =
980-(179+680) =
324-(27+24) =
642-(542+11) =
533-(333+129) =
555-(65+455) =
579-(279+169) =
794-(163+494) =
661-(168+461)=
750-(13+650) =
474-(274+165) =
715-(161+515) =
623-(47+523) =
561-(461+74) =
210-(83+110) =
682-(38+582) =
970-(870+49) =
523-(25+423) =
845-(645+69) =
772-(11+472) =
660-(460+68) =
274-(174+97) =
435-(235+25) =
611-(95+411) =
982-(782+85) =
692-(44+392) =
440-(244+140) =
812-(512+158) =
903-(803+26) =
478-(178+238) =
256-(38+56) =
419-(319+19) =
491-(391+51) =
676-(29+576) =
770-(470+237) =
696-(74+496) =
352-(133+152) =
694-43-594=
807-42-707 =
983-198-683 =
981-121-681=
763-71-463 =
524-25-324 =
577-134-277=
359-(39+259) =
253-(91+153) =
808-(25+708) =
463-(263+77) =
898-(27+698) =
760-(46+660) =
967-(281+667) =
187-(31+87) =
359-(159+168) =
721-(621+16) =
853-(553+38) =
510-(137+310) =
860-(124+560) =
779-(248+479) =
367-(167+67) =
410-(154+210) =
897-(597+146) =
859-65-559 =
331-141-131 =
738-47-638=
305-77-205 =
917-49-617 =
438-52-138=
721-239-421 =
498-188-198 =
846-149-646=
164-91-64 =
383-27-183 =
832-76-632=
407-115-207 =
580-97-280 =
423-41-323=
895-14-795 =
400-119-200 =
366-11-266=
203-28-3 =
276-119-76 =
449-289-149=
900-88-700 =
254-35-154 =
364-52-264=
945-107-745 =
616-226-316 =
623-19-423=
881-24-681 =
825-116-625 =
312-182-112=
935-101-635 =
595-81-495 =
695-41-495=
517-61-217 =
336-23-136 =
851-43-651=
851-83-751 =
511-74-411 =
858-13-758=
889-28-789 =
696-84-596 =
693-107-393=
541-247-241 =
826-137-526 =
908-46-608=
992-126-792 =
351-65-251 =
9.6+20.03-11.03 =
12.01+7.12-8.01 =
12.99+10.48-4.99 =
4.37+15.14-0.14 =
16.07+3.95-10.07 =
16.32+2.94-6.32 =
1.14+19.36-0.36 =
1.17+19.75-7.75 =
0.33+17.89-16.89 =
4.16+15.16-9.16 =
19.74+5.15-12.74 =
5.61+16.58-8.58 =
20.91+0.63-0.91 =
19.63+9.47-16.63 =
1.03+18.14-4.14 =
17.38+6.37-10.38 =
3.86+7.17-0.86 =
4.23+19.63-18.63 =
10.26+16.93-12.93 =
4.88+17.88-1.88 =
5.92+3.32-1.32 =
3.99+5.99-3.99 =
8.99+17.21-6.21 =
15.46+7.37-7.46 =
6.17+17.65-4.65 =
19.45+9.28-16.45 =
15.69+0.72-1.69 =
18.24+4.32-6.24 =
8.44+11.04-0.04 =
8.76+10.33-6.33 =
9.32+7.97-3.32 =
9.09+3.75-0.09 =
10.51+16.1-3.1 =
13.31+10.95-10.31 =
14.62+4.69-8.62 =
7.41+18.45-7.45 =
9.26+13.41-11.41 =
18.73+2.35-6.73 =
4.73+12.04-1.04 =
1.81+7.13-1.13 =
7.43+20.15-3.15 =
19.9+5.54-6.9 =
19.51+5.7-7.51 =
2.56+19.58-0.58 =
1.15+7.35-0.35 =
12.59+8.92-1.59 =
1.94+13.63-10.63 =
2.62+19.03-0.03 =
14.66+1.3-7.66 =
20.74+6.27-0.74 =
14.13+6.08-2.13 =
10.06+11.8-2.8 =
16.12+1.46-9.12 =
2.44+18.07-8.07 =
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