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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 675 · 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 78 =
  2. 2.Half of 56 =
  3. 3.Double 58 =
  4. 4.Double 61 =
  5. 5.Double 83 =
  6. 6.Double 75 =
  7. 7.Double 91 =
  8. 8.Double 22 =
  9. 9.Double 73 =
  10. 10.Half of 102 =
  11. 11.Half of 80 =
  12. 12.Double 28 =
  13. 13.Double 49 =
  14. 14.Half of 70 =
  15. 15.Half of 132 =
  16. 16.Double 16 =
  17. 17.Half of 166 =
  18. 18.Double 81 =
  19. 19.Double 56 =
  20. 20.Double 24 =
  21. 21.Double 71 =
  22. 22.Half of 174 =
  23. 23.Double 55 =
  24. 24.Double 62 =
  25. 25.Half of 180 =
  26. 26.Double 68 =
  27. 27.Half of 76 =
  28. 28.Half of 158 =
  29. 29.Half of 128 =
  30. 30.Half of 112 =
  31. 31.Double 41 =
  32. 32.Double 31 =
  33. 33.Half of 120 =
  34. 34.Double 25 =
  35. 35.Half of 146 =
  36. 36.Double 88 =
  37. 37.Half of 48 =
  38. 38.Half of 190 =
  39. 39.Half of 188 =
  40. 40.Half of 196 =

Answer key

  1. 39
  2. 28
  3. 116
  4. 122
  5. 166
  6. 150
  7. 182
  8. 44
  9. 146
  10. 51
  11. 40
  12. 56
  13. 98
  14. 35
  15. 66
  16. 32
  17. 83
  18. 162
  19. 112
  20. 48
  21. 142
  22. 87
  23. 110
  24. 124
  25. 90
  26. 136
  27. 38
  28. 79
  29. 64
  30. 56
  31. 82
  32. 62
  33. 60
  34. 50
  35. 73
  36. 176
  37. 24
  38. 95
  39. 94
  40. 98

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