Simple calculation of 13 and 2 / 13 minus 2.27 minus 7 and 3 / 4

13 and 2 / 13 - (2.27 + 7 and 3 / 4) = 13 and 2 / 13-10.02 = 13 and 2 / 13-10 and 1 / 50=
9 and 25 / 12

16 × (3 / 4 + 5 / 9) × 27,

=3 / 4 × 16 × 27 + 5 / 9 × 27 × 16
=324+240
=564

Simple calculation of 12 × (5 / 6-5 / 9) × 27

12 × (5 / 6-5 / 9) × 27
=(12*(5/6)-12*(5/9))*27
=(10-20/3)*27
=27*10-27*(20/3)
=270-180
=90

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