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10 1/2 - 2 3/4

= 10 (1 x 2)/(2/2) - 2 3/4

= 10 2/4 - 2 3/4

= 9 6/4 - 2 3/4

= (9 - 2) (6/4 - 3/4)

= 7 (6 - 3)/4

= 7 3/4

Or

10 1/2 - 2 3/4

= 21/2 - 11/4

= (21 x 2)/(2 x 2) - 11/4

= 42/4 - 11/4

= (42 - 11)/4

= 31/4

= 7 3/4

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∙ 17y ago
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