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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 354 · 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 66 =
  3. 3.Half of 34 =
  4. 4.Double 31 =
  5. 5.Double 24 =
  6. 6.Half of 162 =
  7. 7.Double 47 =
  8. 8.Half of 168 =
  9. 9.Double 37 =
  10. 10.Double 43 =
  11. 11.Double 41 =
  12. 12.Double 21 =
  13. 13.Double 89 =
  14. 14.Half of 186 =
  15. 15.Double 22 =
  16. 16.Double 87 =
  17. 17.Half of 76 =
  18. 18.Double 83 =
  19. 19.Double 16 =
  20. 20.Half of 46 =
  21. 21.Double 57 =
  22. 22.Half of 32 =
  23. 23.Double 78 =
  24. 24.Double 75 =
  25. 25.Double 68 =
  26. 26.Double 44 =
  27. 27.Half of 182 =
  28. 28.Half of 56 =
  29. 29.Half of 166 =
  30. 30.Double 93 =
  31. 31.Double 55 =
  32. 32.Half of 180 =
  33. 33.Double 71 =
  34. 34.Half of 142 =
  35. 35.Half of 64 =
  36. 36.Half of 178 =
  37. 37.Half of 170 =
  38. 38.Half of 184 =
  39. 39.Double 99 =
  40. 40.Double 61 =

Answer key

  1. 162
  2. 132
  3. 17
  4. 62
  5. 48
  6. 81
  7. 94
  8. 84
  9. 74
  10. 86
  11. 82
  12. 42
  13. 178
  14. 93
  15. 44
  16. 174
  17. 38
  18. 166
  19. 32
  20. 23
  21. 114
  22. 16
  23. 156
  24. 150
  25. 136
  26. 88
  27. 91
  28. 28
  29. 83
  30. 186
  31. 110
  32. 90
  33. 142
  34. 71
  35. 32
  36. 89
  37. 85
  38. 92
  39. 198
  40. 122

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