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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 115 · 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 27 =
  2. 2.Double 61 =
  3. 3.Double 34 =
  4. 4.Double 41 =
  5. 5.Half of 32 =
  6. 6.Half of 108 =
  7. 7.Half of 192 =
  8. 8.Double 29 =
  9. 9.Half of 184 =
  10. 10.Half of 148 =
  11. 11.Half of 190 =
  12. 12.Double 44 =
  13. 13.Double 78 =
  14. 14.Double 65 =
  15. 15.Double 95 =
  16. 16.Double 48 =
  17. 17.Double 31 =
  18. 18.Half of 188 =
  19. 19.Double 57 =
  20. 20.Double 25 =
  21. 21.Double 53 =
  22. 22.Double 17 =
  23. 23.Half of 40 =
  24. 24.Double 76 =
  25. 25.Double 67 =
  26. 26.Double 36 =
  27. 27.Double 75 =
  28. 28.Half of 194 =
  29. 29.Half of 180 =
  30. 30.Double 74 =
  31. 31.Half of 86 =
  32. 32.Half of 76 =
  33. 33.Half of 164 =
  34. 34.Half of 74 =
  35. 35.Double 37 =
  36. 36.Half of 144 =
  37. 37.Half of 142 =
  38. 38.Double 32 =
  39. 39.Double 84 =
  40. 40.Double 79 =

Answer key

  1. 54
  2. 122
  3. 68
  4. 82
  5. 16
  6. 54
  7. 96
  8. 58
  9. 92
  10. 74
  11. 95
  12. 88
  13. 156
  14. 130
  15. 190
  16. 96
  17. 62
  18. 94
  19. 114
  20. 50
  21. 106
  22. 34
  23. 20
  24. 152
  25. 134
  26. 72
  27. 150
  28. 97
  29. 90
  30. 148
  31. 43
  32. 38
  33. 82
  34. 37
  35. 74
  36. 72
  37. 71
  38. 64
  39. 168
  40. 158

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