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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 57 · 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 114 =
  2. 2.Double 38 =
  3. 3.Double 43 =
  4. 4.Half of 174 =
  5. 5.Double 59 =
  6. 6.Double 42 =
  7. 7.Half of 106 =
  8. 8.Half of 88 =
  9. 9.Half of 76 =
  10. 10.Half of 146 =
  11. 11.Half of 64 =
  12. 12.Double 79 =
  13. 13.Double 75 =
  14. 14.Half of 52 =
  15. 15.Double 66 =
  16. 16.Double 39 =
  17. 17.Double 65 =
  18. 18.Half of 112 =
  19. 19.Half of 86 =
  20. 20.Double 74 =
  21. 21.Half of 82 =
  22. 22.Half of 126 =
  23. 23.Double 55 =
  24. 24.Double 19 =
  25. 25.Half of 72 =
  26. 26.Double 26 =
  27. 27.Half of 50 =
  28. 28.Double 91 =
  29. 29.Half of 46 =
  30. 30.Double 85 =
  31. 31.Half of 48 =
  32. 32.Double 31 =
  33. 33.Half of 186 =
  34. 34.Double 94 =
  35. 35.Double 48 =
  36. 36.Half of 42 =
  37. 37.Double 73 =
  38. 38.Half of 154 =
  39. 39.Double 29 =
  40. 40.Double 51 =

Answer key

  1. 57
  2. 76
  3. 86
  4. 87
  5. 118
  6. 84
  7. 53
  8. 44
  9. 38
  10. 73
  11. 32
  12. 158
  13. 150
  14. 26
  15. 132
  16. 78
  17. 130
  18. 56
  19. 43
  20. 148
  21. 41
  22. 63
  23. 110
  24. 38
  25. 36
  26. 52
  27. 25
  28. 182
  29. 23
  30. 170
  31. 24
  32. 62
  33. 93
  34. 188
  35. 96
  36. 21
  37. 146
  38. 77
  39. 58
  40. 102

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