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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 141 · 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.Double 95 =
  2. 2.Half of 84 =
  3. 3.Half of 196 =
  4. 4.Double 88 =
  5. 5.Double 26 =
  6. 6.Double 69 =
  7. 7.Double 73 =
  8. 8.Double 34 =
  9. 9.Half of 138 =
  10. 10.Half of 114 =
  11. 11.Double 57 =
  12. 12.Double 24 =
  13. 13.Double 59 =
  14. 14.Half of 108 =
  15. 15.Half of 184 =
  16. 16.Half of 162 =
  17. 17.Half of 58 =
  18. 18.Double 47 =
  19. 19.Half of 46 =
  20. 20.Half of 90 =
  21. 21.Double 91 =
  22. 22.Half of 44 =
  23. 23.Half of 140 =
  24. 24.Half of 178 =
  25. 25.Half of 122 =
  26. 26.Half of 96 =
  27. 27.Double 18 =
  28. 28.Half of 104 =
  29. 29.Half of 166 =
  30. 30.Double 41 =
  31. 31.Half of 188 =
  32. 32.Half of 34 =
  33. 33.Half of 142 =
  34. 34.Half of 116 =
  35. 35.Double 78 =
  36. 36.Half of 70 =
  37. 37.Half of 152 =
  38. 38.Double 43 =
  39. 39.Double 75 =
  40. 40.Double 32 =

Answer key

  1. 190
  2. 42
  3. 98
  4. 176
  5. 52
  6. 138
  7. 146
  8. 68
  9. 69
  10. 57
  11. 114
  12. 48
  13. 118
  14. 54
  15. 92
  16. 81
  17. 29
  18. 94
  19. 23
  20. 45
  21. 182
  22. 22
  23. 70
  24. 89
  25. 61
  26. 48
  27. 36
  28. 52
  29. 83
  30. 82
  31. 94
  32. 17
  33. 71
  34. 58
  35. 156
  36. 35
  37. 76
  38. 86
  39. 150
  40. 64

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