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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 198 · 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 142 =
  2. 2.Half of 134 =
  3. 3.Double 25 =
  4. 4.Double 24 =
  5. 5.Half of 188 =
  6. 6.Double 81 =
  7. 7.Half of 28 =
  8. 8.Half of 172 =
  9. 9.Half of 36 =
  10. 10.Double 51 =
  11. 11.Half of 88 =
  12. 12.Double 35 =
  13. 13.Double 87 =
  14. 14.Half of 58 =
  15. 15.Double 77 =
  16. 16.Double 65 =
  17. 17.Half of 30 =
  18. 18.Double 49 =
  19. 19.Double 97 =
  20. 20.Double 44 =
  21. 21.Half of 116 =
  22. 22.Double 53 =
  23. 23.Half of 46 =
  24. 24.Half of 122 =
  25. 25.Half of 98 =
  26. 26.Double 43 =
  27. 27.Double 92 =
  28. 28.Double 64 =
  29. 29.Double 91 =
  30. 30.Double 59 =
  31. 31.Double 56 =
  32. 32.Double 83 =
  33. 33.Half of 192 =
  34. 34.Half of 38 =
  35. 35.Double 84 =
  36. 36.Half of 56 =
  37. 37.Double 47 =
  38. 38.Half of 180 =
  39. 39.Half of 114 =
  40. 40.Double 98 =

Answer key

  1. 71
  2. 67
  3. 50
  4. 48
  5. 94
  6. 162
  7. 14
  8. 86
  9. 18
  10. 102
  11. 44
  12. 70
  13. 174
  14. 29
  15. 154
  16. 130
  17. 15
  18. 98
  19. 194
  20. 88
  21. 58
  22. 106
  23. 23
  24. 61
  25. 49
  26. 86
  27. 184
  28. 128
  29. 182
  30. 118
  31. 112
  32. 166
  33. 96
  34. 19
  35. 168
  36. 28
  37. 94
  38. 90
  39. 57
  40. 196

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