简便计算题

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简便计算题



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) =222221777778 =111111000000－111111 =111110888889

15）56000 ÷ （14000 ÷ 16） 16）654321 × 909090 +654321×90909 =56000÷14000×16 =654321×999999 =4×16 =654321×(100000－1) =64 =654321000000－654321 =654320345679

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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÷24×75÷25×81÷27 =2×3×3 =18

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