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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）

= 125×8×4×17

=1000×68

=68000

=480×(375＋625)

=480000

3）25 × 16 ×125

=25×2×8×125

=50000

=1287

4）13 × 99

=13×(100－1)

=1300－13

=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

=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

=21×(67+18)+85×79

=21×85+85×79

=85×(21+79)

=8500

=321×(81+19)

=32100

=222222×(1000000－1)

=222222000000－222222

=222221777778

=111111×999999

=111111×(1000000－1)

=111111000000－111111

=111110888889

=56000÷14000×16

=4×16

=64

=654320345679

16）654321 × 909090 +654321×90909

=654321×999999

=654321×(100000－1)

=654321000000－654321

=34×35×101－35×34×101

=0

=216

18）27000 ÷ 125

=27×1000÷125

=27×8

=345×1001÷(15×1001)

=345÷15×1001÷1001

=23

=350×4－3+8+2－1

=1400+6

=1406

=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

=48÷24×75÷25×81÷27

=2×3×3

=18