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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 54 · 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 136 =
  2. 2.Half of 80 =
  3. 3.Half of 54 =
  4. 4.Double 91 =
  5. 5.Half of 124 =
  6. 6.Half of 84 =
  7. 7.Half of 172 =
  8. 8.Double 94 =
  9. 9.Double 42 =
  10. 10.Double 55 =
  11. 11.Double 76 =
  12. 12.Half of 90 =
  13. 13.Double 16 =
  14. 14.Half of 162 =
  15. 15.Half of 128 =
  16. 16.Half of 68 =
  17. 17.Double 36 =
  18. 18.Double 57 =
  19. 19.Half of 112 =
  20. 20.Half of 92 =
  21. 21.Double 53 =
  22. 22.Double 25 =
  23. 23.Half of 152 =
  24. 24.Double 44 =
  25. 25.Double 41 =
  26. 26.Half of 140 =
  27. 27.Double 81 =
  28. 28.Double 98 =
  29. 29.Double 71 =
  30. 30.Double 27 =
  31. 31.Half of 138 =
  32. 32.Double 54 =
  33. 33.Double 93 =
  34. 34.Half of 114 =
  35. 35.Double 84 =
  36. 36.Double 89 =
  37. 37.Double 47 =
  38. 38.Double 67 =
  39. 39.Double 59 =
  40. 40.Double 78 =

Answer key

  1. 68
  2. 40
  3. 27
  4. 182
  5. 62
  6. 42
  7. 86
  8. 188
  9. 84
  10. 110
  11. 152
  12. 45
  13. 32
  14. 81
  15. 64
  16. 34
  17. 72
  18. 114
  19. 56
  20. 46
  21. 106
  22. 50
  23. 76
  24. 88
  25. 82
  26. 70
  27. 162
  28. 196
  29. 142
  30. 54
  31. 69
  32. 108
  33. 186
  34. 57
  35. 168
  36. 178
  37. 94
  38. 134
  39. 118
  40. 156

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