四年级数学简便计算题及答案.doc

四年级数学简便计算题及答案
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〕222222 × 999999 14〕333333 × 333333

15〕56000 ÷ 〔14000 ÷ 16〕 16〕654321 × 909090 +654321 × 90909

17〕34 × 3535 －35 × 3434 18〕27000 ÷ 125

19〕345345 ÷ 15015 20〕347 + 358 + 352 + 349

21〕75 × 45 + 17 × 25 22〕599996 + 49997 + 3998 + 407 + 89

23〕〔48 × 75 ×81〕÷〔24 × 25 × 27〕
实用文档.

四年级数学简便计算题及答案:
1〕125 ×〔17 × 8〕× 4 2〕375 × 480 + 6250 × 48
= 125×8×4×17 =480×(375＋625)
=1000×68 =480000
=68000

3〕25 × 16 ×125 4〕13 × 99
=25×2×8×125 =13×(100－1)
=50000 =1300－13
=1287

5〕75000 ÷ 125 ÷ 15 6〕7900 ÷ 4 ÷ 25
=75×1000÷125÷15 =7900÷(4×25)
=75÷15×1000÷125 =79
=5×8
=40

7〕150 × 40 ÷ 50 8〕5600 ÷〔25 × 7〕
=150÷50×40 =56×100÷25÷7
=3×40 =56÷7×100÷25
=120 =32

9〕210 ÷ 42 × 6 10〕39600 ÷ 25
=210÷7÷6×6 =396×100÷25
=30 =396×4
=1584

11〕67 × 21 ＋18 × 21 + 85 × 79 12〕321 × 81 + 321 × 19
=21×(67+18)+85×79 =321×(81+19)
=21×85+85×79 =32100
=85×(21+79)
=8500

13〕222222 × 999999 14〕333333 × 333333
=222222×(1000000－1) =111111×999999
=222222000000－222222 =111111×(1000000－1)

15〕56000 ÷ 〔14000 ÷ 16〕 16〕654321 × 909090 +654321×90909 =56000÷14000×16 =654321×999999
实用文档.
=4×16 =654321×(100000－1)
=64 =654321000000－654321
=654320345679
17〕34 × 3535 －35 × 3434 18〕27000 ÷ 125
=34×35×101－35×34×101 =27×1000÷125
=0 =27×8
=216

19〕345345 ÷ 15015 20〕347 + 358 + 352 + 349
=345×1001÷(15×1001) =350×4－3+8+2－1
=345÷15×1001÷1001 =1400+6
=23 =1406

21〕75 × 45 + 17 × 25 22) 599996 + 49997 + 3998 + 407 + 89 =25×3×45+17×25 =600000+50000+4000－4－3－2+407+89
=25×(135+17) =65400+487
=25×152 =65887
=25×4×38
=3800

23〕〔48 × 75 ×81〕÷〔24 × 25 × 27〕
=48 × 75 ×81÷24÷25÷27
=48÷24×75÷25×81÷27
=2×3×3
=18
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实用文档.