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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 50 · 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 99 =
  2. 2.Double 54 =
  3. 3.Double 18 =
  4. 4.Half of 130 =
  5. 5.Double 48 =
  6. 6.Double 38 =
  7. 7.Double 79 =
  8. 8.Double 78 =
  9. 9.Half of 44 =
  10. 10.Half of 62 =
  11. 11.Half of 192 =
  12. 12.Half of 128 =
  13. 13.Half of 54 =
  14. 14.Double 42 =
  15. 15.Half of 116 =
  16. 16.Double 86 =
  17. 17.Double 91 =
  18. 18.Double 52 =
  19. 19.Half of 134 =
  20. 20.Half of 74 =
  21. 21.Half of 154 =
  22. 22.Double 24 =
  23. 23.Double 62 =
  24. 24.Half of 72 =
  25. 25.Half of 172 =
  26. 26.Double 67 =
  27. 27.Double 74 =
  28. 28.Half of 64 =
  29. 29.Half of 108 =
  30. 30.Double 29 =
  31. 31.Half of 106 =
  32. 32.Double 73 =
  33. 33.Double 64 =
  34. 34.Double 31 =
  35. 35.Double 22 =
  36. 36.Half of 164 =
  37. 37.Double 55 =
  38. 38.Double 68 =
  39. 39.Half of 94 =
  40. 40.Double 71 =

Answer key

  1. 198
  2. 108
  3. 36
  4. 65
  5. 96
  6. 76
  7. 158
  8. 156
  9. 22
  10. 31
  11. 96
  12. 64
  13. 27
  14. 84
  15. 58
  16. 172
  17. 182
  18. 104
  19. 67
  20. 37
  21. 77
  22. 48
  23. 124
  24. 36
  25. 86
  26. 134
  27. 148
  28. 32
  29. 54
  30. 58
  31. 53
  32. 146
  33. 128
  34. 62
  35. 44
  36. 82
  37. 110
  38. 136
  39. 47
  40. 142

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