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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 496 · 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 16 =
  2. 2.Double 63 =
  3. 3.Double 23 =
  4. 4.Double 83 =
  5. 5.Double 77 =
  6. 6.Half of 132 =
  7. 7.Double 31 =
  8. 8.Half of 48 =
  9. 9.Half of 44 =
  10. 10.Half of 186 =
  11. 11.Half of 192 =
  12. 12.Half of 28 =
  13. 13.Double 35 =
  14. 14.Half of 42 =
  15. 15.Half of 162 =
  16. 16.Half of 130 =
  17. 17.Double 84 =
  18. 18.Double 73 =
  19. 19.Double 42 =
  20. 20.Double 54 =
  21. 21.Half of 86 =
  22. 22.Double 51 =
  23. 23.Half of 138 =
  24. 24.Half of 52 =
  25. 25.Double 52 =
  26. 26.Half of 50 =
  27. 27.Half of 154 =
  28. 28.Double 58 =
  29. 29.Half of 116 =
  30. 30.Half of 164 =
  31. 31.Double 71 =
  32. 32.Double 82 =
  33. 33.Double 49 =
  34. 34.Double 36 =
  35. 35.Double 96 =
  36. 36.Double 48 =
  37. 37.Half of 134 =
  38. 38.Double 46 =
  39. 39.Half of 102 =
  40. 40.Half of 74 =

Answer key

  1. 32
  2. 126
  3. 46
  4. 166
  5. 154
  6. 66
  7. 62
  8. 24
  9. 22
  10. 93
  11. 96
  12. 14
  13. 70
  14. 21
  15. 81
  16. 65
  17. 168
  18. 146
  19. 84
  20. 108
  21. 43
  22. 102
  23. 69
  24. 26
  25. 104
  26. 25
  27. 77
  28. 116
  29. 58
  30. 82
  31. 142
  32. 164
  33. 98
  34. 72
  35. 192
  36. 96
  37. 67
  38. 92
  39. 51
  40. 37

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