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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 316 · 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 84 =
  2. 2.Double 25 =
  3. 3.Double 95 =
  4. 4.Half of 138 =
  5. 5.Double 86 =
  6. 6.Half of 122 =
  7. 7.Double 79 =
  8. 8.Half of 60 =
  9. 9.Half of 136 =
  10. 10.Half of 36 =
  11. 11.Half of 44 =
  12. 12.Double 58 =
  13. 13.Double 24 =
  14. 14.Double 81 =
  15. 15.Half of 168 =
  16. 16.Double 88 =
  17. 17.Double 77 =
  18. 18.Double 84 =
  19. 19.Double 63 =
  20. 20.Half of 78 =
  21. 21.Half of 156 =
  22. 22.Double 75 =
  23. 23.Double 71 =
  24. 24.Half of 38 =
  25. 25.Double 28 =
  26. 26.Half of 66 =
  27. 27.Half of 102 =
  28. 28.Half of 62 =
  29. 29.Double 35 =
  30. 30.Half of 148 =
  31. 31.Half of 196 =
  32. 32.Double 33 =
  33. 33.Half of 176 =
  34. 34.Double 56 =
  35. 35.Double 57 =
  36. 36.Half of 92 =
  37. 37.Double 61 =
  38. 38.Half of 186 =
  39. 39.Half of 128 =
  40. 40.Double 85 =

Answer key

  1. 42
  2. 50
  3. 190
  4. 69
  5. 172
  6. 61
  7. 158
  8. 30
  9. 68
  10. 18
  11. 22
  12. 116
  13. 48
  14. 162
  15. 84
  16. 176
  17. 154
  18. 168
  19. 126
  20. 39
  21. 78
  22. 150
  23. 142
  24. 19
  25. 56
  26. 33
  27. 51
  28. 31
  29. 70
  30. 74
  31. 98
  32. 66
  33. 88
  34. 112
  35. 114
  36. 46
  37. 122
  38. 93
  39. 64
  40. 170

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