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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 222 · 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 104 =
  2. 2.Double 16 =
  3. 3.Double 66 =
  4. 4.Double 46 =
  5. 5.Double 19 =
  6. 6.Half of 32 =
  7. 7.Half of 140 =
  8. 8.Double 86 =
  9. 9.Half of 44 =
  10. 10.Double 73 =
  11. 11.Double 21 =
  12. 12.Half of 138 =
  13. 13.Half of 174 =
  14. 14.Double 69 =
  15. 15.Double 65 =
  16. 16.Half of 142 =
  17. 17.Double 91 =
  18. 18.Double 59 =
  19. 19.Double 92 =
  20. 20.Half of 54 =
  21. 21.Double 22 =
  22. 22.Half of 82 =
  23. 23.Half of 74 =
  24. 24.Double 37 =
  25. 25.Half of 114 =
  26. 26.Half of 50 =
  27. 27.Half of 46 =
  28. 28.Double 82 =
  29. 29.Half of 186 =
  30. 30.Double 74 =
  31. 31.Half of 112 =
  32. 32.Double 47 =
  33. 33.Double 33 =
  34. 34.Double 77 =
  35. 35.Half of 180 =
  36. 36.Half of 48 =
  37. 37.Half of 56 =
  38. 38.Double 57 =
  39. 39.Half of 116 =
  40. 40.Double 27 =

Answer key

  1. 52
  2. 32
  3. 132
  4. 92
  5. 38
  6. 16
  7. 70
  8. 172
  9. 22
  10. 146
  11. 42
  12. 69
  13. 87
  14. 138
  15. 130
  16. 71
  17. 182
  18. 118
  19. 184
  20. 27
  21. 44
  22. 41
  23. 37
  24. 74
  25. 57
  26. 25
  27. 23
  28. 164
  29. 93
  30. 148
  31. 56
  32. 94
  33. 66
  34. 154
  35. 90
  36. 24
  37. 28
  38. 114
  39. 58
  40. 54

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