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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 531 · 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 21 =
  2. 2.Half of 174 =
  3. 3.Double 31 =
  4. 4.Double 22 =
  5. 5.Double 47 =
  6. 6.Double 61 =
  7. 7.Half of 120 =
  8. 8.Double 27 =
  9. 9.Half of 190 =
  10. 10.Double 16 =
  11. 11.Half of 140 =
  12. 12.Half of 152 =
  13. 13.Double 72 =
  14. 14.Half of 160 =
  15. 15.Double 32 =
  16. 16.Double 41 =
  17. 17.Half of 52 =
  18. 18.Double 48 =
  19. 19.Half of 38 =
  20. 20.Half of 82 =
  21. 21.Half of 178 =
  22. 22.Double 56 =
  23. 23.Double 49 =
  24. 24.Double 57 =
  25. 25.Double 62 =
  26. 26.Double 51 =
  27. 27.Double 81 =
  28. 28.Half of 88 =
  29. 29.Double 92 =
  30. 30.Double 77 =
  31. 31.Double 71 =
  32. 32.Half of 146 =
  33. 33.Half of 182 =
  34. 34.Double 67 =
  35. 35.Double 25 =
  36. 36.Double 68 =
  37. 37.Half of 188 =
  38. 38.Double 42 =
  39. 39.Half of 108 =
  40. 40.Double 88 =

Answer key

  1. 42
  2. 87
  3. 62
  4. 44
  5. 94
  6. 122
  7. 60
  8. 54
  9. 95
  10. 32
  11. 70
  12. 76
  13. 144
  14. 80
  15. 64
  16. 82
  17. 26
  18. 96
  19. 19
  20. 41
  21. 89
  22. 112
  23. 98
  24. 114
  25. 124
  26. 102
  27. 162
  28. 44
  29. 184
  30. 154
  31. 142
  32. 73
  33. 91
  34. 134
  35. 50
  36. 136
  37. 94
  38. 84
  39. 54
  40. 176

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