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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 220 · 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.Half of 108 =
  2. 2.Double 64 =
  3. 3.Double 56 =
  4. 4.Half of 30 =
  5. 5.Double 95 =
  6. 6.Half of 40 =
  7. 7.Half of 118 =
  8. 8.Double 61 =
  9. 9.Half of 184 =
  10. 10.Double 27 =
  11. 11.Half of 106 =
  12. 12.Double 47 =
  13. 13.Half of 76 =
  14. 14.Double 68 =
  15. 15.Half of 26 =
  16. 16.Double 53 =
  17. 17.Half of 168 =
  18. 18.Half of 172 =
  19. 19.Double 16 =
  20. 20.Double 33 =
  21. 21.Double 78 =
  22. 22.Double 54 =
  23. 23.Half of 72 =
  24. 24.Half of 82 =
  25. 25.Double 75 =
  26. 26.Double 66 =
  27. 27.Double 43 =
  28. 28.Double 92 =
  29. 29.Half of 148 =
  30. 30.Double 51 =
  31. 31.Double 87 =
  32. 32.Half of 66 =
  33. 33.Double 46 =
  34. 34.Half of 186 =
  35. 35.Half of 94 =
  36. 36.Double 71 =
  37. 37.Double 31 =
  38. 38.Double 32 =
  39. 39.Double 22 =
  40. 40.Double 52 =

Answer key

  1. 54
  2. 128
  3. 112
  4. 15
  5. 190
  6. 20
  7. 59
  8. 122
  9. 92
  10. 54
  11. 53
  12. 94
  13. 38
  14. 136
  15. 13
  16. 106
  17. 84
  18. 86
  19. 32
  20. 66
  21. 156
  22. 108
  23. 36
  24. 41
  25. 150
  26. 132
  27. 86
  28. 184
  29. 74
  30. 102
  31. 174
  32. 33
  33. 92
  34. 93
  35. 47
  36. 142
  37. 62
  38. 64
  39. 44
  40. 104

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