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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 465 · 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 192 =
  2. 2.Double 28 =
  3. 3.Half of 152 =
  4. 4.Double 44 =
  5. 5.Half of 136 =
  6. 6.Double 67 =
  7. 7.Double 62 =
  8. 8.Half of 94 =
  9. 9.Half of 144 =
  10. 10.Double 74 =
  11. 11.Double 53 =
  12. 12.Half of 108 =
  13. 13.Double 39 =
  14. 14.Double 57 =
  15. 15.Half of 76 =
  16. 16.Half of 56 =
  17. 17.Half of 54 =
  18. 18.Double 97 =
  19. 19.Double 85 =
  20. 20.Double 68 =
  21. 21.Half of 84 =
  22. 22.Half of 170 =
  23. 23.Double 35 =
  24. 24.Double 79 =
  25. 25.Double 45 =
  26. 26.Half of 30 =
  27. 27.Double 95 =
  28. 28.Double 61 =
  29. 29.Half of 146 =
  30. 30.Half of 186 =
  31. 31.Double 32 =
  32. 32.Half of 142 =
  33. 33.Double 76 =
  34. 34.Double 55 =
  35. 35.Double 18 =
  36. 36.Double 21 =
  37. 37.Double 77 =
  38. 38.Half of 116 =
  39. 39.Double 41 =
  40. 40.Double 29 =

Answer key

  1. 96
  2. 56
  3. 76
  4. 88
  5. 68
  6. 134
  7. 124
  8. 47
  9. 72
  10. 148
  11. 106
  12. 54
  13. 78
  14. 114
  15. 38
  16. 28
  17. 27
  18. 194
  19. 170
  20. 136
  21. 42
  22. 85
  23. 70
  24. 158
  25. 90
  26. 15
  27. 190
  28. 122
  29. 73
  30. 93
  31. 64
  32. 71
  33. 152
  34. 110
  35. 36
  36. 42
  37. 154
  38. 58
  39. 82
  40. 58

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