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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 137 · 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 81 =
  2. 2.Half of 176 =
  3. 3.Double 99 =
  4. 4.Double 71 =
  5. 5.Double 92 =
  6. 6.Half of 124 =
  7. 7.Double 54 =
  8. 8.Half of 144 =
  9. 9.Half of 128 =
  10. 10.Half of 168 =
  11. 11.Half of 52 =
  12. 12.Double 62 =
  13. 13.Double 61 =
  14. 14.Half of 82 =
  15. 15.Half of 72 =
  16. 16.Double 56 =
  17. 17.Half of 118 =
  18. 18.Half of 96 =
  19. 19.Half of 182 =
  20. 20.Double 18 =
  21. 21.Half of 172 =
  22. 22.Half of 104 =
  23. 23.Double 63 =
  24. 24.Double 87 =
  25. 25.Double 31 =
  26. 26.Half of 106 =
  27. 27.Half of 64 =
  28. 28.Double 97 =
  29. 29.Double 33 =
  30. 30.Half of 114 =
  31. 31.Half of 94 =
  32. 32.Half of 194 =
  33. 33.Double 39 =
  34. 34.Double 66 =
  35. 35.Double 53 =
  36. 36.Double 58 =
  37. 37.Double 72 =
  38. 38.Double 77 =
  39. 39.Double 36 =
  40. 40.Half of 48 =

Answer key

  1. 162
  2. 88
  3. 198
  4. 142
  5. 184
  6. 62
  7. 108
  8. 72
  9. 64
  10. 84
  11. 26
  12. 124
  13. 122
  14. 41
  15. 36
  16. 112
  17. 59
  18. 48
  19. 91
  20. 36
  21. 86
  22. 52
  23. 126
  24. 174
  25. 62
  26. 53
  27. 32
  28. 194
  29. 66
  30. 57
  31. 47
  32. 97
  33. 78
  34. 132
  35. 106
  36. 116
  37. 144
  38. 154
  39. 72
  40. 24

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