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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 770 · 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 38 =
  2. 2.Half of 178 =
  3. 3.Double 84 =
  4. 4.Half of 82 =
  5. 5.Double 69 =
  6. 6.Double 34 =
  7. 7.Half of 86 =
  8. 8.Double 62 =
  9. 9.Half of 146 =
  10. 10.Double 93 =
  11. 11.Double 48 =
  12. 12.Double 78 =
  13. 13.Double 18 =
  14. 14.Double 61 =
  15. 15.Half of 144 =
  16. 16.Half of 96 =
  17. 17.Double 81 =
  18. 18.Double 27 =
  19. 19.Double 36 =
  20. 20.Half of 152 =
  21. 21.Half of 154 =
  22. 22.Double 83 =
  23. 23.Double 32 =
  24. 24.Half of 110 =
  25. 25.Half of 184 =
  26. 26.Double 25 =
  27. 27.Half of 182 =
  28. 28.Half of 34 =
  29. 29.Double 35 =
  30. 30.Double 71 =
  31. 31.Half of 54 =
  32. 32.Half of 140 =
  33. 33.Half of 40 =
  34. 34.Half of 84 =
  35. 35.Half of 198 =
  36. 36.Double 72 =
  37. 37.Double 16 =
  38. 38.Half of 164 =
  39. 39.Double 98 =
  40. 40.Double 75 =

Answer key

  1. 19
  2. 89
  3. 168
  4. 41
  5. 138
  6. 68
  7. 43
  8. 124
  9. 73
  10. 186
  11. 96
  12. 156
  13. 36
  14. 122
  15. 72
  16. 48
  17. 162
  18. 54
  19. 72
  20. 76
  21. 77
  22. 166
  23. 64
  24. 55
  25. 92
  26. 50
  27. 91
  28. 17
  29. 70
  30. 142
  31. 27
  32. 70
  33. 20
  34. 42
  35. 99
  36. 144
  37. 32
  38. 82
  39. 196
  40. 150

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