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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 515 · 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 61 =
  2. 2.Half of 86 =
  3. 3.Half of 68 =
  4. 4.Double 45 =
  5. 5.Double 22 =
  6. 6.Half of 110 =
  7. 7.Double 17 =
  8. 8.Double 58 =
  9. 9.Half of 38 =
  10. 10.Double 51 =
  11. 11.Half of 130 =
  12. 12.Double 55 =
  13. 13.Half of 102 =
  14. 14.Double 24 =
  15. 15.Double 83 =
  16. 16.Half of 174 =
  17. 17.Double 41 =
  18. 18.Double 73 =
  19. 19.Half of 116 =
  20. 20.Double 86 =
  21. 21.Double 81 =
  22. 22.Double 97 =
  23. 23.Half of 186 =
  24. 24.Double 35 =
  25. 25.Double 93 =
  26. 26.Double 28 =
  27. 27.Half of 42 =
  28. 28.Half of 152 =
  29. 29.Double 26 =
  30. 30.Double 33 =
  31. 31.Half of 92 =
  32. 32.Double 95 =
  33. 33.Half of 44 =
  34. 34.Double 39 =
  35. 35.Half of 166 =
  36. 36.Double 89 =
  37. 37.Double 79 =
  38. 38.Half of 94 =
  39. 39.Double 44 =
  40. 40.Double 71 =

Answer key

  1. 122
  2. 43
  3. 34
  4. 90
  5. 44
  6. 55
  7. 34
  8. 116
  9. 19
  10. 102
  11. 65
  12. 110
  13. 51
  14. 48
  15. 166
  16. 87
  17. 82
  18. 146
  19. 58
  20. 172
  21. 162
  22. 194
  23. 93
  24. 70
  25. 186
  26. 56
  27. 21
  28. 76
  29. 52
  30. 66
  31. 46
  32. 190
  33. 22
  34. 78
  35. 83
  36. 178
  37. 158
  38. 47
  39. 88
  40. 142

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