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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 347 · 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 26 =
  2. 2.Half of 58 =
  3. 3.Double 82 =
  4. 4.Double 58 =
  5. 5.Half of 44 =
  6. 6.Double 78 =
  7. 7.Half of 68 =
  8. 8.Double 54 =
  9. 9.Double 61 =
  10. 10.Double 32 =
  11. 11.Double 47 =
  12. 12.Double 81 =
  13. 13.Double 21 =
  14. 14.Half of 32 =
  15. 15.Double 19 =
  16. 16.Half of 124 =
  17. 17.Double 25 =
  18. 18.Half of 70 =
  19. 19.Half of 34 =
  20. 20.Double 42 =
  21. 21.Half of 64 =
  22. 22.Double 87 =
  23. 23.Double 85 =
  24. 24.Half of 148 =
  25. 25.Double 17 =
  26. 26.Double 51 =
  27. 27.Double 23 =
  28. 28.Half of 192 =
  29. 29.Half of 120 =
  30. 30.Double 57 =
  31. 31.Half of 62 =
  32. 32.Half of 136 =
  33. 33.Double 66 =
  34. 34.Half of 26 =
  35. 35.Half of 72 =
  36. 36.Half of 176 =
  37. 37.Half of 190 =
  38. 38.Half of 150 =
  39. 39.Double 29 =
  40. 40.Half of 170 =

Answer key

  1. 52
  2. 29
  3. 164
  4. 116
  5. 22
  6. 156
  7. 34
  8. 108
  9. 122
  10. 64
  11. 94
  12. 162
  13. 42
  14. 16
  15. 38
  16. 62
  17. 50
  18. 35
  19. 17
  20. 84
  21. 32
  22. 174
  23. 170
  24. 74
  25. 34
  26. 102
  27. 46
  28. 96
  29. 60
  30. 114
  31. 31
  32. 68
  33. 132
  34. 13
  35. 36
  36. 88
  37. 95
  38. 75
  39. 58
  40. 85

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