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Answer Key 1.3

  1. 641
    64
    24
  2. (1)3=1
  3. 3+8÷4
    3+2
    5
  4. 5(1)36
    536
    180
  5. 8÷42
    22
    4
  6. 2+6=8
  7. [9(25)]÷6
    [9(3)]÷6
    [6]÷6
    1
  8. (282)÷(4)
    32÷4
    8
  9. 6+(6)2÷3
    6+36÷3
    6+12
    6
  10. 12÷[22+6]
    12÷2
    − 6
  11. 42|916|
    42(7)
    414
    10
  12. 16÷45
    45
    9
  13. (1+5)(5)
    4(5)
    20
  14. 3{3[3(6)+2]}
    3{3[18+2]}
    3{3[16]}
    3{19}
    22
  15. [2+4|7+4|]÷[8+15]
    [2+4(11)]÷23
    2+44÷23
    46÷23
    2
  16. 4[22442210]
    4[58]
    54
  17. [12+2+6](5+|3|)
    (20)(5+3)
    (20)(2)
    40
  18. 6+36[2(4)]
    36[2+4]
    36[2]
    312
    15
  19. 15216[1+3]
    15÷(3[2])
    15÷(5)
    3
  20. 25+25|1632|6
    50|16|6
    50166
    5010
    5
  21. 4844[4+3](16+9)÷5
    56[1]25÷5
    555
    11
  22. 18(3)1(1)+3
    155
    3
  23. 8+4244[25]
    123
    4
  24. 13+912+1[10+6]{9÷[169(1)8]}+12
    11[4]{9÷[1]}+12
    159+12
    153
    5

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