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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 297 · 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 55 =
  2. 2.Half of 138 =
  3. 3.Half of 70 =
  4. 4.Double 58 =
  5. 5.Double 51 =
  6. 6.Double 19 =
  7. 7.Half of 62 =
  8. 8.Double 29 =
  9. 9.Half of 48 =
  10. 10.Half of 76 =
  11. 11.Double 33 =
  12. 12.Double 45 =
  13. 13.Double 37 =
  14. 14.Half of 164 =
  15. 15.Half of 28 =
  16. 16.Half of 162 =
  17. 17.Half of 34 =
  18. 18.Double 48 =
  19. 19.Half of 84 =
  20. 20.Double 88 =
  21. 21.Double 69 =
  22. 22.Double 21 =
  23. 23.Double 81 =
  24. 24.Double 47 =
  25. 25.Double 89 =
  26. 26.Double 61 =
  27. 27.Double 22 =
  28. 28.Half of 196 =
  29. 29.Double 99 =
  30. 30.Half of 54 =
  31. 31.Half of 170 =
  32. 32.Half of 80 =
  33. 33.Double 91 =
  34. 34.Half of 132 =
  35. 35.Half of 114 =
  36. 36.Half of 122 =
  37. 37.Double 59 =
  38. 38.Half of 186 =
  39. 39.Double 31 =
  40. 40.Half of 60 =

Answer key

  1. 110
  2. 69
  3. 35
  4. 116
  5. 102
  6. 38
  7. 31
  8. 58
  9. 24
  10. 38
  11. 66
  12. 90
  13. 74
  14. 82
  15. 14
  16. 81
  17. 17
  18. 96
  19. 42
  20. 176
  21. 138
  22. 42
  23. 162
  24. 94
  25. 178
  26. 122
  27. 44
  28. 98
  29. 198
  30. 27
  31. 85
  32. 40
  33. 182
  34. 66
  35. 57
  36. 61
  37. 118
  38. 93
  39. 62
  40. 30

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