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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 432 · 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 28 =
  2. 2.Half of 40 =
  3. 3.Half of 136 =
  4. 4.Half of 84 =
  5. 5.Half of 196 =
  6. 6.Half of 152 =
  7. 7.Double 73 =
  8. 8.Double 88 =
  9. 9.Half of 114 =
  10. 10.Double 51 =
  11. 11.Half of 30 =
  12. 12.Double 52 =
  13. 13.Half of 62 =
  14. 14.Half of 54 =
  15. 15.Double 18 =
  16. 16.Double 32 =
  17. 17.Half of 194 =
  18. 18.Double 68 =
  19. 19.Double 16 =
  20. 20.Half of 116 =
  21. 21.Double 37 =
  22. 22.Double 89 =
  23. 23.Double 81 =
  24. 24.Double 47 =
  25. 25.Double 41 =
  26. 26.Double 86 =
  27. 27.Double 44 =
  28. 28.Half of 112 =
  29. 29.Double 27 =
  30. 30.Double 22 =
  31. 31.Double 85 =
  32. 32.Double 35 =
  33. 33.Double 43 =
  34. 34.Double 39 =
  35. 35.Double 46 =
  36. 36.Half of 68 =
  37. 37.Half of 50 =
  38. 38.Double 33 =
  39. 39.Half of 158 =
  40. 40.Half of 122 =

Answer key

  1. 14
  2. 20
  3. 68
  4. 42
  5. 98
  6. 76
  7. 146
  8. 176
  9. 57
  10. 102
  11. 15
  12. 104
  13. 31
  14. 27
  15. 36
  16. 64
  17. 97
  18. 136
  19. 32
  20. 58
  21. 74
  22. 178
  23. 162
  24. 94
  25. 82
  26. 172
  27. 88
  28. 56
  29. 54
  30. 44
  31. 170
  32. 70
  33. 86
  34. 78
  35. 92
  36. 34
  37. 25
  38. 66
  39. 79
  40. 61

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