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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 349 · 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 37 =
  2. 2.Double 33 =
  3. 3.Half of 166 =
  4. 4.Half of 86 =
  5. 5.Double 21 =
  6. 6.Double 24 =
  7. 7.Double 31 =
  8. 8.Half of 114 =
  9. 9.Double 45 =
  10. 10.Half of 54 =
  11. 11.Half of 122 =
  12. 12.Double 89 =
  13. 13.Double 98 =
  14. 14.Double 97 =
  15. 15.Double 83 =
  16. 16.Double 95 =
  17. 17.Double 75 =
  18. 18.Half of 164 =
  19. 19.Double 27 =
  20. 20.Half of 28 =
  21. 21.Half of 96 =
  22. 22.Double 52 =
  23. 23.Double 81 =
  24. 24.Double 46 =
  25. 25.Double 61 =
  26. 26.Half of 104 =
  27. 27.Half of 152 =
  28. 28.Double 64 =
  29. 29.Half of 172 =
  30. 30.Double 62 =
  31. 31.Half of 74 =
  32. 32.Half of 84 =
  33. 33.Double 41 =
  34. 34.Double 16 =
  35. 35.Double 39 =
  36. 36.Double 44 =
  37. 37.Double 87 =
  38. 38.Half of 62 =
  39. 39.Half of 126 =
  40. 40.Half of 160 =

Answer key

  1. 74
  2. 66
  3. 83
  4. 43
  5. 42
  6. 48
  7. 62
  8. 57
  9. 90
  10. 27
  11. 61
  12. 178
  13. 196
  14. 194
  15. 166
  16. 190
  17. 150
  18. 82
  19. 54
  20. 14
  21. 48
  22. 104
  23. 162
  24. 92
  25. 122
  26. 52
  27. 76
  28. 128
  29. 86
  30. 124
  31. 37
  32. 42
  33. 82
  34. 32
  35. 78
  36. 88
  37. 174
  38. 31
  39. 63
  40. 80

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