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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 375 · 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 62 =
  2. 2.Double 88 =
  3. 3.Double 58 =
  4. 4.Half of 174 =
  5. 5.Half of 172 =
  6. 6.Double 52 =
  7. 7.Double 91 =
  8. 8.Double 49 =
  9. 9.Double 17 =
  10. 10.Double 27 =
  11. 11.Double 31 =
  12. 12.Double 18 =
  13. 13.Double 33 =
  14. 14.Half of 90 =
  15. 15.Half of 54 =
  16. 16.Half of 132 =
  17. 17.Double 41 =
  18. 18.Double 72 =
  19. 19.Double 32 =
  20. 20.Double 81 =
  21. 21.Double 56 =
  22. 22.Double 26 =
  23. 23.Half of 62 =
  24. 24.Double 21 =
  25. 25.Half of 28 =
  26. 26.Half of 46 =
  27. 27.Half of 38 =
  28. 28.Double 61 =
  29. 29.Double 29 =
  30. 30.Double 77 =
  31. 31.Half of 94 =
  32. 32.Half of 86 =
  33. 33.Double 24 =
  34. 34.Half of 108 =
  35. 35.Double 71 =
  36. 36.Half of 76 =
  37. 37.Half of 198 =
  38. 38.Half of 82 =
  39. 39.Half of 194 =
  40. 40.Half of 190 =

Answer key

  1. 124
  2. 176
  3. 116
  4. 87
  5. 86
  6. 104
  7. 182
  8. 98
  9. 34
  10. 54
  11. 62
  12. 36
  13. 66
  14. 45
  15. 27
  16. 66
  17. 82
  18. 144
  19. 64
  20. 162
  21. 112
  22. 52
  23. 31
  24. 42
  25. 14
  26. 23
  27. 19
  28. 122
  29. 58
  30. 154
  31. 47
  32. 43
  33. 48
  34. 54
  35. 142
  36. 38
  37. 99
  38. 41
  39. 97
  40. 95

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