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Transcript

87 - 9 =

87-9 = 78

78

77

- 10

87

+ 1

453 - 9 =

453-9 = 444

444

443

- 10

453

+ 1

756 - 90 =

756-90 = 666

666

656

- 100

756

+ 10

834- 99 =

834-99 = 735

735

734

-100

834

+ 1