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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 446 · 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 32 =
  2. 2.Half of 136 =
  3. 3.Double 96 =
  4. 4.Half of 150 =
  5. 5.Half of 54 =
  6. 6.Half of 174 =
  7. 7.Half of 78 =
  8. 8.Double 21 =
  9. 9.Half of 156 =
  10. 10.Double 48 =
  11. 11.Half of 184 =
  12. 12.Double 88 =
  13. 13.Double 31 =
  14. 14.Double 91 =
  15. 15.Double 99 =
  16. 16.Half of 148 =
  17. 17.Half of 172 =
  18. 18.Half of 120 =
  19. 19.Double 36 =
  20. 20.Double 28 =
  21. 21.Half of 82 =
  22. 22.Double 75 =
  23. 23.Half of 108 =
  24. 24.Half of 188 =
  25. 25.Double 24 =
  26. 26.Half of 152 =
  27. 27.Half of 92 =
  28. 28.Double 81 =
  29. 29.Half of 196 =
  30. 30.Half of 68 =
  31. 31.Half of 180 =
  32. 32.Half of 40 =
  33. 33.Half of 96 =
  34. 34.Double 67 =
  35. 35.Double 41 =
  36. 36.Half of 88 =
  37. 37.Double 39 =
  38. 38.Half of 70 =
  39. 39.Double 65 =
  40. 40.Double 76 =

Answer key

  1. 64
  2. 68
  3. 192
  4. 75
  5. 27
  6. 87
  7. 39
  8. 42
  9. 78
  10. 96
  11. 92
  12. 176
  13. 62
  14. 182
  15. 198
  16. 74
  17. 86
  18. 60
  19. 72
  20. 56
  21. 41
  22. 150
  23. 54
  24. 94
  25. 48
  26. 76
  27. 46
  28. 162
  29. 98
  30. 34
  31. 90
  32. 20
  33. 48
  34. 134
  35. 82
  36. 44
  37. 78
  38. 35
  39. 130
  40. 152

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