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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 783 · 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 28 =
  2. 2.Half of 36 =
  3. 3.Half of 184 =
  4. 4.Double 56 =
  5. 5.Half of 52 =
  6. 6.Double 61 =
  7. 7.Half of 114 =
  8. 8.Half of 62 =
  9. 9.Half of 72 =
  10. 10.Double 39 =
  11. 11.Double 95 =
  12. 12.Double 71 =
  13. 13.Half of 164 =
  14. 14.Half of 92 =
  15. 15.Double 64 =
  16. 16.Double 35 =
  17. 17.Double 91 =
  18. 18.Half of 148 =
  19. 19.Half of 112 =
  20. 20.Half of 108 =
  21. 21.Half of 70 =
  22. 22.Double 41 =
  23. 23.Half of 32 =
  24. 24.Double 43 =
  25. 25.Half of 140 =
  26. 26.Double 32 =
  27. 27.Half of 152 =
  28. 28.Double 66 =
  29. 29.Double 81 =
  30. 30.Half of 122 =
  31. 31.Half of 26 =
  32. 32.Half of 162 =
  33. 33.Double 21 =
  34. 34.Double 82 =
  35. 35.Half of 34 =
  36. 36.Half of 50 =
  37. 37.Double 63 =
  38. 38.Half of 74 =
  39. 39.Double 22 =
  40. 40.Double 25 =

Answer key

  1. 56
  2. 18
  3. 92
  4. 112
  5. 26
  6. 122
  7. 57
  8. 31
  9. 36
  10. 78
  11. 190
  12. 142
  13. 82
  14. 46
  15. 128
  16. 70
  17. 182
  18. 74
  19. 56
  20. 54
  21. 35
  22. 82
  23. 16
  24. 86
  25. 70
  26. 64
  27. 76
  28. 132
  29. 162
  30. 61
  31. 13
  32. 81
  33. 42
  34. 164
  35. 17
  36. 25
  37. 126
  38. 37
  39. 44
  40. 50

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