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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 542 · 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 39 =
  2. 2.Double 48 =
  3. 3.Half of 136 =
  4. 4.Double 98 =
  5. 5.Half of 126 =
  6. 6.Double 32 =
  7. 7.Half of 134 =
  8. 8.Double 51 =
  9. 9.Half of 86 =
  10. 10.Double 26 =
  11. 11.Half of 168 =
  12. 12.Double 68 =
  13. 13.Double 41 =
  14. 14.Half of 166 =
  15. 15.Double 61 =
  16. 16.Half of 162 =
  17. 17.Double 82 =
  18. 18.Half of 106 =
  19. 19.Double 21 =
  20. 20.Double 28 =
  21. 21.Half of 196 =
  22. 22.Half of 66 =
  23. 23.Double 16 =
  24. 24.Half of 54 =
  25. 25.Half of 156 =
  26. 26.Double 62 =
  27. 27.Half of 174 =
  28. 28.Half of 104 =
  29. 29.Double 66 =
  30. 30.Half of 146 =
  31. 31.Double 75 =
  32. 32.Double 36 =
  33. 33.Half of 172 =
  34. 34.Half of 140 =
  35. 35.Half of 44 =
  36. 36.Half of 96 =
  37. 37.Half of 158 =
  38. 38.Double 47 =
  39. 39.Half of 40 =
  40. 40.Half of 26 =

Answer key

  1. 78
  2. 96
  3. 68
  4. 196
  5. 63
  6. 64
  7. 67
  8. 102
  9. 43
  10. 52
  11. 84
  12. 136
  13. 82
  14. 83
  15. 122
  16. 81
  17. 164
  18. 53
  19. 42
  20. 56
  21. 98
  22. 33
  23. 32
  24. 27
  25. 78
  26. 124
  27. 87
  28. 52
  29. 132
  30. 73
  31. 150
  32. 72
  33. 86
  34. 70
  35. 22
  36. 48
  37. 79
  38. 94
  39. 20
  40. 13

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