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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 792 · 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 59 =
  2. 2.Double 22 =
  3. 3.Half of 166 =
  4. 4.Half of 164 =
  5. 5.Half of 40 =
  6. 6.Double 34 =
  7. 7.Half of 138 =
  8. 8.Half of 176 =
  9. 9.Half of 44 =
  10. 10.Double 58 =
  11. 11.Double 81 =
  12. 12.Double 73 =
  13. 13.Half of 68 =
  14. 14.Half of 86 =
  15. 15.Half of 126 =
  16. 16.Half of 88 =
  17. 17.Double 43 =
  18. 18.Double 45 =
  19. 19.Double 33 =
  20. 20.Half of 98 =
  21. 21.Half of 162 =
  22. 22.Double 78 =
  23. 23.Half of 78 =
  24. 24.Half of 38 =
  25. 25.Double 51 =
  26. 26.Half of 190 =
  27. 27.Double 42 =
  28. 28.Half of 54 =
  29. 29.Double 44 =
  30. 30.Double 19 =
  31. 31.Double 95 =
  32. 32.Double 39 =
  33. 33.Double 29 =
  34. 34.Half of 80 =
  35. 35.Half of 146 =
  36. 36.Double 71 =
  37. 37.Half of 116 =
  38. 38.Half of 60 =
  39. 39.Half of 156 =
  40. 40.Double 21 =

Answer key

  1. 118
  2. 44
  3. 83
  4. 82
  5. 20
  6. 68
  7. 69
  8. 88
  9. 22
  10. 116
  11. 162
  12. 146
  13. 34
  14. 43
  15. 63
  16. 44
  17. 86
  18. 90
  19. 66
  20. 49
  21. 81
  22. 156
  23. 39
  24. 19
  25. 102
  26. 95
  27. 84
  28. 27
  29. 88
  30. 38
  31. 190
  32. 78
  33. 58
  34. 40
  35. 73
  36. 142
  37. 58
  38. 30
  39. 78
  40. 42

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