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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 266 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 122 =
  2. 2.Double 54 =
  3. 3.Half of 168 =
  4. 4.Half of 164 =
  5. 5.Double 29 =
  6. 6.Half of 196 =
  7. 7.Double 56 =
  8. 8.Double 91 =
  9. 9.Double 37 =
  10. 10.Half of 114 =
  11. 11.Double 31 =
  12. 12.Half of 158 =
  13. 13.Double 46 =
  14. 14.Half of 160 =
  15. 15.Double 25 =
  16. 16.Double 94 =
  17. 17.Half of 140 =
  18. 18.Half of 70 =
  19. 19.Half of 126 =
  20. 20.Half of 112 =
  21. 21.Double 27 =
  22. 22.Double 97 =
  23. 23.Double 39 =
  24. 24.Half of 26 =
  25. 25.Half of 38 =
  26. 26.Half of 86 =
  27. 27.Double 79 =
  28. 28.Half of 98 =
  29. 29.Double 58 =
  30. 30.Half of 62 =
  31. 31.Half of 142 =
  32. 32.Double 47 =
  33. 33.Half of 186 =
  34. 34.Double 96 =
  35. 35.Half of 192 =
  36. 36.Double 21 =
  37. 37.Double 41 =
  38. 38.Double 61 =
  39. 39.Half of 124 =
  40. 40.Half of 190 =

Answer key

  1. 61
  2. 108
  3. 84
  4. 82
  5. 58
  6. 98
  7. 112
  8. 182
  9. 74
  10. 57
  11. 62
  12. 79
  13. 92
  14. 80
  15. 50
  16. 188
  17. 70
  18. 35
  19. 63
  20. 56
  21. 54
  22. 194
  23. 78
  24. 13
  25. 19
  26. 43
  27. 158
  28. 49
  29. 116
  30. 31
  31. 71
  32. 94
  33. 93
  34. 192
  35. 96
  36. 42
  37. 82
  38. 122
  39. 62
  40. 95

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