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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 258 · 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 156 =
  3. 3.Double 72 =
  4. 4.Double 16 =
  5. 5.Double 58 =
  6. 6.Double 54 =
  7. 7.Double 17 =
  8. 8.Double 95 =
  9. 9.Double 86 =
  10. 10.Half of 114 =
  11. 11.Double 87 =
  12. 12.Half of 54 =
  13. 13.Double 75 =
  14. 14.Half of 100 =
  15. 15.Double 77 =
  16. 16.Double 67 =
  17. 17.Half of 34 =
  18. 18.Double 34 =
  19. 19.Double 91 =
  20. 20.Double 78 =
  21. 21.Half of 62 =
  22. 22.Double 71 =
  23. 23.Double 68 =
  24. 24.Double 48 =
  25. 25.Double 23 =
  26. 26.Half of 50 =
  27. 27.Half of 140 =
  28. 28.Half of 136 =
  29. 29.Half of 172 =
  30. 30.Half of 94 =
  31. 31.Half of 142 =
  32. 32.Half of 108 =
  33. 33.Double 88 =
  34. 34.Half of 104 =
  35. 35.Double 45 =
  36. 36.Double 21 =
  37. 37.Half of 164 =
  38. 38.Double 81 =
  39. 39.Double 76 =
  40. 40.Half of 64 =

Answer key

  1. 56
  2. 78
  3. 144
  4. 32
  5. 116
  6. 108
  7. 34
  8. 190
  9. 172
  10. 57
  11. 174
  12. 27
  13. 150
  14. 50
  15. 154
  16. 134
  17. 17
  18. 68
  19. 182
  20. 156
  21. 31
  22. 142
  23. 136
  24. 96
  25. 46
  26. 25
  27. 70
  28. 68
  29. 86
  30. 47
  31. 71
  32. 54
  33. 176
  34. 52
  35. 90
  36. 42
  37. 82
  38. 162
  39. 152
  40. 32

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