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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 653 · 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 72 =
  2. 2.Double 31 =
  3. 3.Double 39 =
  4. 4.Double 81 =
  5. 5.Double 76 =
  6. 6.Half of 190 =
  7. 7.Half of 88 =
  8. 8.Half of 182 =
  9. 9.Double 32 =
  10. 10.Half of 54 =
  11. 11.Half of 134 =
  12. 12.Half of 78 =
  13. 13.Double 22 =
  14. 14.Double 71 =
  15. 15.Double 53 =
  16. 16.Double 69 =
  17. 17.Double 63 =
  18. 18.Half of 138 =
  19. 19.Double 21 =
  20. 20.Double 64 =
  21. 21.Half of 58 =
  22. 22.Double 49 =
  23. 23.Half of 64 =
  24. 24.Double 29 =
  25. 25.Half of 82 =
  26. 26.Double 88 =
  27. 27.Double 77 =
  28. 28.Half of 114 =
  29. 29.Double 65 =
  30. 30.Double 73 =
  31. 31.Half of 104 =
  32. 32.Double 41 =
  33. 33.Double 87 =
  34. 34.Double 58 =
  35. 35.Half of 130 =
  36. 36.Double 26 =
  37. 37.Half of 176 =
  38. 38.Double 48 =
  39. 39.Double 66 =
  40. 40.Half of 166 =

Answer key

  1. 144
  2. 62
  3. 78
  4. 162
  5. 152
  6. 95
  7. 44
  8. 91
  9. 64
  10. 27
  11. 67
  12. 39
  13. 44
  14. 142
  15. 106
  16. 138
  17. 126
  18. 69
  19. 42
  20. 128
  21. 29
  22. 98
  23. 32
  24. 58
  25. 41
  26. 176
  27. 154
  28. 57
  29. 130
  30. 146
  31. 52
  32. 82
  33. 174
  34. 116
  35. 65
  36. 52
  37. 88
  38. 96
  39. 132
  40. 83

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