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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 529 · 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 81 =
  2. 2.Double 26 =
  3. 3.Half of 182 =
  4. 4.Half of 174 =
  5. 5.Double 64 =
  6. 6.Double 36 =
  7. 7.Half of 146 =
  8. 8.Double 23 =
  9. 9.Half of 118 =
  10. 10.Double 67 =
  11. 11.Double 41 =
  12. 12.Half of 82 =
  13. 13.Double 89 =
  14. 14.Half of 128 =
  15. 15.Half of 156 =
  16. 16.Double 29 =
  17. 17.Half of 88 =
  18. 18.Double 48 =
  19. 19.Half of 110 =
  20. 20.Half of 86 =
  21. 21.Double 25 =
  22. 22.Half of 152 =
  23. 23.Half of 164 =
  24. 24.Half of 192 =
  25. 25.Double 35 =
  26. 26.Double 59 =
  27. 27.Half of 190 =
  28. 28.Half of 184 =
  29. 29.Double 71 =
  30. 30.Double 74 =
  31. 31.Half of 124 =
  32. 32.Double 32 =
  33. 33.Half of 84 =
  34. 34.Double 53 =
  35. 35.Double 54 =
  36. 36.Double 21 =
  37. 37.Half of 70 =
  38. 38.Half of 34 =
  39. 39.Double 72 =
  40. 40.Half of 148 =

Answer key

  1. 162
  2. 52
  3. 91
  4. 87
  5. 128
  6. 72
  7. 73
  8. 46
  9. 59
  10. 134
  11. 82
  12. 41
  13. 178
  14. 64
  15. 78
  16. 58
  17. 44
  18. 96
  19. 55
  20. 43
  21. 50
  22. 76
  23. 82
  24. 96
  25. 70
  26. 118
  27. 95
  28. 92
  29. 142
  30. 148
  31. 62
  32. 64
  33. 42
  34. 106
  35. 108
  36. 42
  37. 35
  38. 17
  39. 144
  40. 74

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