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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 87 · 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.Double 33 =
  3. 3.Half of 92 =
  4. 4.Half of 68 =
  5. 5.Double 93 =
  6. 6.Half of 52 =
  7. 7.Half of 180 =
  8. 8.Double 91 =
  9. 9.Half of 58 =
  10. 10.Double 56 =
  11. 11.Half of 144 =
  12. 12.Half of 178 =
  13. 13.Double 37 =
  14. 14.Double 69 =
  15. 15.Half of 56 =
  16. 16.Half of 64 =
  17. 17.Double 52 =
  18. 18.Double 95 =
  19. 19.Half of 32 =
  20. 20.Half of 156 =
  21. 21.Double 83 =
  22. 22.Double 47 =
  23. 23.Half of 196 =
  24. 24.Double 41 =
  25. 25.Double 34 =
  26. 26.Half of 62 =
  27. 27.Double 73 =
  28. 28.Double 94 =
  29. 29.Half of 118 =
  30. 30.Half of 190 =
  31. 31.Half of 172 =
  32. 32.Half of 164 =
  33. 33.Half of 28 =
  34. 34.Half of 36 =
  35. 35.Double 84 =
  36. 36.Half of 162 =
  37. 37.Double 78 =
  38. 38.Double 57 =
  39. 39.Half of 166 =
  40. 40.Double 92 =

Answer key

  1. 17
  2. 66
  3. 46
  4. 34
  5. 186
  6. 26
  7. 90
  8. 182
  9. 29
  10. 112
  11. 72
  12. 89
  13. 74
  14. 138
  15. 28
  16. 32
  17. 104
  18. 190
  19. 16
  20. 78
  21. 166
  22. 94
  23. 98
  24. 82
  25. 68
  26. 31
  27. 146
  28. 188
  29. 59
  30. 95
  31. 86
  32. 82
  33. 14
  34. 18
  35. 168
  36. 81
  37. 156
  38. 114
  39. 83
  40. 184

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