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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 399 · 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 66 =
  2. 2.Half of 74 =
  3. 3.Half of 190 =
  4. 4.Double 83 =
  5. 5.Half of 28 =
  6. 6.Half of 152 =
  7. 7.Double 19 =
  8. 8.Half of 114 =
  9. 9.Half of 66 =
  10. 10.Double 73 =
  11. 11.Double 27 =
  12. 12.Half of 142 =
  13. 13.Half of 136 =
  14. 14.Half of 126 =
  15. 15.Double 69 =
  16. 16.Double 31 =
  17. 17.Double 28 =
  18. 18.Half of 104 =
  19. 19.Double 81 =
  20. 20.Double 34 =
  21. 21.Half of 88 =
  22. 22.Double 61 =
  23. 23.Double 87 =
  24. 24.Half of 130 =
  25. 25.Half of 92 =
  26. 26.Half of 118 =
  27. 27.Double 49 =
  28. 28.Double 91 =
  29. 29.Double 45 =
  30. 30.Double 41 =
  31. 31.Double 17 =
  32. 32.Double 77 =
  33. 33.Double 79 =
  34. 34.Half of 164 =
  35. 35.Double 65 =
  36. 36.Half of 82 =
  37. 37.Half of 70 =
  38. 38.Half of 62 =
  39. 39.Double 54 =
  40. 40.Double 21 =

Answer key

  1. 132
  2. 37
  3. 95
  4. 166
  5. 14
  6. 76
  7. 38
  8. 57
  9. 33
  10. 146
  11. 54
  12. 71
  13. 68
  14. 63
  15. 138
  16. 62
  17. 56
  18. 52
  19. 162
  20. 68
  21. 44
  22. 122
  23. 174
  24. 65
  25. 46
  26. 59
  27. 98
  28. 182
  29. 90
  30. 82
  31. 34
  32. 154
  33. 158
  34. 82
  35. 130
  36. 41
  37. 35
  38. 31
  39. 108
  40. 42

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