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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 486 · 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 17 =
  2. 2.Double 63 =
  3. 3.Half of 142 =
  4. 4.Half of 136 =
  5. 5.Half of 150 =
  6. 6.Half of 188 =
  7. 7.Half of 166 =
  8. 8.Double 44 =
  9. 9.Double 51 =
  10. 10.Double 76 =
  11. 11.Half of 118 =
  12. 12.Half of 174 =
  13. 13.Half of 30 =
  14. 14.Double 95 =
  15. 15.Half of 34 =
  16. 16.Half of 134 =
  17. 17.Double 19 =
  18. 18.Half of 90 =
  19. 19.Half of 116 =
  20. 20.Double 29 =
  21. 21.Half of 72 =
  22. 22.Half of 68 =
  23. 23.Double 42 =
  24. 24.Half of 46 =
  25. 25.Double 47 =
  26. 26.Double 22 =
  27. 27.Double 99 =
  28. 28.Double 39 =
  29. 29.Half of 146 =
  30. 30.Double 59 =
  31. 31.Half of 198 =
  32. 32.Half of 54 =
  33. 33.Double 41 =
  34. 34.Double 24 =
  35. 35.Half of 184 =
  36. 36.Double 52 =
  37. 37.Half of 64 =
  38. 38.Half of 182 =
  39. 39.Double 58 =
  40. 40.Double 83 =

Answer key

  1. 34
  2. 126
  3. 71
  4. 68
  5. 75
  6. 94
  7. 83
  8. 88
  9. 102
  10. 152
  11. 59
  12. 87
  13. 15
  14. 190
  15. 17
  16. 67
  17. 38
  18. 45
  19. 58
  20. 58
  21. 36
  22. 34
  23. 84
  24. 23
  25. 94
  26. 44
  27. 198
  28. 78
  29. 73
  30. 118
  31. 99
  32. 27
  33. 82
  34. 48
  35. 92
  36. 104
  37. 32
  38. 91
  39. 116
  40. 166

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