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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 318 · 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.Half of 32 =
  2. 2.Double 19 =
  3. 3.Half of 168 =
  4. 4.Double 67 =
  5. 5.Double 93 =
  6. 6.Half of 196 =
  7. 7.Half of 162 =
  8. 8.Double 89 =
  9. 9.Double 47 =
  10. 10.Double 43 =
  11. 11.Half of 54 =
  12. 12.Double 86 =
  13. 13.Double 62 =
  14. 14.Double 21 =
  15. 15.Half of 64 =
  16. 16.Double 28 =
  17. 17.Half of 114 =
  18. 18.Half of 52 =
  19. 19.Double 64 =
  20. 20.Double 71 =
  21. 21.Half of 192 =
  22. 22.Double 51 =
  23. 23.Half of 102 =
  24. 24.Double 36 =
  25. 25.Double 44 =
  26. 26.Double 22 =
  27. 27.Double 39 =
  28. 28.Double 81 =
  29. 29.Double 32 =
  30. 30.Double 18 =
  31. 31.Half of 58 =
  32. 32.Half of 178 =
  33. 33.Half of 104 =
  34. 34.Half of 68 =
  35. 35.Double 54 =
  36. 36.Double 29 =
  37. 37.Half of 194 =
  38. 38.Half of 38 =
  39. 39.Half of 28 =
  40. 40.Double 38 =

Answer key

  1. 16
  2. 38
  3. 84
  4. 134
  5. 186
  6. 98
  7. 81
  8. 178
  9. 94
  10. 86
  11. 27
  12. 172
  13. 124
  14. 42
  15. 32
  16. 56
  17. 57
  18. 26
  19. 128
  20. 142
  21. 96
  22. 102
  23. 51
  24. 72
  25. 88
  26. 44
  27. 78
  28. 162
  29. 64
  30. 36
  31. 29
  32. 89
  33. 52
  34. 34
  35. 108
  36. 58
  37. 97
  38. 19
  39. 14
  40. 76

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