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MENTAL COMPUTATION

MENTAL COMPUTATION. 1. ADDITION AND SUBTRACTION. (1). 6 + 5 =. (2). 3 + 9 =. (3). 6 + 6 =. (4). 7 + 7 =. (5). 9 + 8 =. (6). 16 + 63 =. (7). 43 + 12 =. (8). 23 + 19 =. (9). 27 + 47 =. (10). 37 + 34 =. (11). 48 + 24 =. (12). 22 + 59 =. (13). 11 + 70 =. (14). 9 + 43 =.

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MENTAL COMPUTATION

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  1. MENTAL COMPUTATION 1. ADDITION AND SUBTRACTION

  2. (1) 6 + 5 =

  3. (2) 3 + 9 =

  4. (3) 6 + 6 =

  5. (4) 7 + 7 =

  6. (5) 9 + 8 =

  7. (6) 16 + 63 =

  8. (7) 43 + 12 =

  9. (8) 23 + 19 =

  10. (9) 27 + 47 =

  11. (10) 37 + 34 =

  12. (11) 48 + 24 =

  13. (12) 22 + 59 =

  14. (13) 11 + 70 =

  15. (14) 9 + 43 =

  16. (15) 17 + 18 =

  17. (16) 97 - 32 =

  18. (17) 85 - 35 =

  19. (18) 76 - 42 =

  20. (19) 99 - 75 =

  21. (20) 79 - 26 =

  22. (21) 78 - 35 =

  23. (22) 51 - 39 =

  24. (23) 81 - 49 =

  25. (24) 62 - 37 =

  26. (25) 55 - 27 =

  27. (26) 81- = 40

  28. (27) 45- = 15

  29. (28) - 80 =16

  30. (29) -10 = 54

  31. (30) - 50 = 20

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