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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 163 · 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 23 =
  2. 2.Half of 38 =
  3. 3.Half of 140 =
  4. 4.Half of 184 =
  5. 5.Double 41 =
  6. 6.Double 45 =
  7. 7.Double 73 =
  8. 8.Half of 36 =
  9. 9.Double 81 =
  10. 10.Half of 144 =
  11. 11.Double 24 =
  12. 12.Double 58 =
  13. 13.Half of 124 =
  14. 14.Double 94 =
  15. 15.Half of 58 =
  16. 16.Half of 142 =
  17. 17.Double 18 =
  18. 18.Half of 196 =
  19. 19.Half of 102 =
  20. 20.Double 95 =
  21. 21.Half of 186 =
  22. 22.Half of 120 =
  23. 23.Double 71 =
  24. 24.Double 35 =
  25. 25.Half of 52 =
  26. 26.Double 85 =
  27. 27.Half of 72 =
  28. 28.Half of 92 =
  29. 29.Double 91 =
  30. 30.Double 69 =
  31. 31.Double 42 =
  32. 32.Double 83 =
  33. 33.Half of 60 =
  34. 34.Double 98 =
  35. 35.Half of 98 =
  36. 36.Double 29 =
  37. 37.Double 21 =
  38. 38.Double 37 =
  39. 39.Double 22 =
  40. 40.Double 68 =

Answer key

  1. 46
  2. 19
  3. 70
  4. 92
  5. 82
  6. 90
  7. 146
  8. 18
  9. 162
  10. 72
  11. 48
  12. 116
  13. 62
  14. 188
  15. 29
  16. 71
  17. 36
  18. 98
  19. 51
  20. 190
  21. 93
  22. 60
  23. 142
  24. 70
  25. 26
  26. 170
  27. 36
  28. 46
  29. 182
  30. 138
  31. 84
  32. 166
  33. 30
  34. 196
  35. 49
  36. 58
  37. 42
  38. 74
  39. 44
  40. 136

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