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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 269 · 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 38 =
  2. 2.Double 16 =
  3. 3.Double 72 =
  4. 4.Half of 156 =
  5. 5.Half of 50 =
  6. 6.Double 42 =
  7. 7.Double 31 =
  8. 8.Double 99 =
  9. 9.Half of 114 =
  10. 10.Half of 36 =
  11. 11.Double 56 =
  12. 12.Double 53 =
  13. 13.Half of 162 =
  14. 14.Double 61 =
  15. 15.Half of 82 =
  16. 16.Double 69 =
  17. 17.Double 87 =
  18. 18.Half of 126 =
  19. 19.Double 35 =
  20. 20.Half of 26 =
  21. 21.Half of 116 =
  22. 22.Double 51 =
  23. 23.Double 66 =
  24. 24.Double 73 =
  25. 25.Half of 52 =
  26. 26.Half of 150 =
  27. 27.Half of 122 =
  28. 28.Half of 154 =
  29. 29.Half of 198 =
  30. 30.Double 97 =
  31. 31.Double 64 =
  32. 32.Double 81 =
  33. 33.Double 32 =
  34. 34.Double 82 =
  35. 35.Half of 190 =
  36. 36.Double 28 =
  37. 37.Double 77 =
  38. 38.Double 85 =
  39. 39.Double 45 =
  40. 40.Half of 100 =

Answer key

  1. 76
  2. 32
  3. 144
  4. 78
  5. 25
  6. 84
  7. 62
  8. 198
  9. 57
  10. 18
  11. 112
  12. 106
  13. 81
  14. 122
  15. 41
  16. 138
  17. 174
  18. 63
  19. 70
  20. 13
  21. 58
  22. 102
  23. 132
  24. 146
  25. 26
  26. 75
  27. 61
  28. 77
  29. 99
  30. 194
  31. 128
  32. 162
  33. 64
  34. 164
  35. 95
  36. 56
  37. 154
  38. 170
  39. 90
  40. 50

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