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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 165 · 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 34 =
  2. 2.Half of 72 =
  3. 3.Half of 84 =
  4. 4.Half of 168 =
  5. 5.Half of 160 =
  6. 6.Double 43 =
  7. 7.Double 96 =
  8. 8.Double 72 =
  9. 9.Double 16 =
  10. 10.Double 38 =
  11. 11.Double 59 =
  12. 12.Double 61 =
  13. 13.Double 73 =
  14. 14.Half of 138 =
  15. 15.Half of 164 =
  16. 16.Double 24 =
  17. 17.Half of 132 =
  18. 18.Double 92 =
  19. 19.Double 32 =
  20. 20.Double 26 =
  21. 21.Half of 180 =
  22. 22.Double 23 =
  23. 23.Half of 144 =
  24. 24.Double 81 =
  25. 25.Half of 158 =
  26. 26.Double 17 =
  27. 27.Double 68 =
  28. 28.Half of 70 =
  29. 29.Double 34 =
  30. 30.Half of 178 =
  31. 31.Half of 102 =
  32. 32.Double 48 =
  33. 33.Double 75 =
  34. 34.Double 71 =
  35. 35.Half of 44 =
  36. 36.Half of 150 =
  37. 37.Half of 78 =
  38. 38.Half of 98 =
  39. 39.Double 74 =
  40. 40.Double 66 =

Answer key

  1. 17
  2. 36
  3. 42
  4. 84
  5. 80
  6. 86
  7. 192
  8. 144
  9. 32
  10. 76
  11. 118
  12. 122
  13. 146
  14. 69
  15. 82
  16. 48
  17. 66
  18. 184
  19. 64
  20. 52
  21. 90
  22. 46
  23. 72
  24. 162
  25. 79
  26. 34
  27. 136
  28. 35
  29. 68
  30. 89
  31. 51
  32. 96
  33. 150
  34. 142
  35. 22
  36. 75
  37. 39
  38. 49
  39. 148
  40. 132

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