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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 629 · 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 82 =
  2. 2.Double 31 =
  3. 3.Double 36 =
  4. 4.Double 91 =
  5. 5.Half of 48 =
  6. 6.Half of 100 =
  7. 7.Double 95 =
  8. 8.Double 46 =
  9. 9.Half of 70 =
  10. 10.Half of 110 =
  11. 11.Half of 130 =
  12. 12.Double 41 =
  13. 13.Half of 174 =
  14. 14.Double 98 =
  15. 15.Half of 76 =
  16. 16.Double 32 =
  17. 17.Double 22 =
  18. 18.Half of 180 =
  19. 19.Double 29 =
  20. 20.Half of 64 =
  21. 21.Half of 114 =
  22. 22.Half of 102 =
  23. 23.Half of 106 =
  24. 24.Double 69 =
  25. 25.Double 21 =
  26. 26.Double 26 =
  27. 27.Double 92 =
  28. 28.Half of 140 =
  29. 29.Double 51 =
  30. 30.Half of 122 =
  31. 31.Double 74 =
  32. 32.Double 81 =
  33. 33.Double 57 =
  34. 34.Double 39 =
  35. 35.Half of 88 =
  36. 36.Double 18 =
  37. 37.Double 96 =
  38. 38.Double 97 =
  39. 39.Half of 132 =
  40. 40.Half of 136 =

Answer key

  1. 41
  2. 62
  3. 72
  4. 182
  5. 24
  6. 50
  7. 190
  8. 92
  9. 35
  10. 55
  11. 65
  12. 82
  13. 87
  14. 196
  15. 38
  16. 64
  17. 44
  18. 90
  19. 58
  20. 32
  21. 57
  22. 51
  23. 53
  24. 138
  25. 42
  26. 52
  27. 184
  28. 70
  29. 102
  30. 61
  31. 148
  32. 162
  33. 114
  34. 78
  35. 44
  36. 36
  37. 192
  38. 194
  39. 66
  40. 68

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