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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 226 · 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 82 =
  2. 2.Half of 78 =
  3. 3.Double 38 =
  4. 4.Half of 148 =
  5. 5.Double 51 =
  6. 6.Half of 68 =
  7. 7.Half of 30 =
  8. 8.Half of 92 =
  9. 9.Half of 86 =
  10. 10.Half of 126 =
  11. 11.Half of 26 =
  12. 12.Half of 72 =
  13. 13.Double 23 =
  14. 14.Half of 196 =
  15. 15.Double 39 =
  16. 16.Half of 54 =
  17. 17.Double 62 =
  18. 18.Double 79 =
  19. 19.Half of 158 =
  20. 20.Double 97 =
  21. 21.Double 48 =
  22. 22.Double 91 =
  23. 23.Double 43 =
  24. 24.Half of 32 =
  25. 25.Half of 136 =
  26. 26.Double 25 =
  27. 27.Half of 84 =
  28. 28.Half of 44 =
  29. 29.Double 71 =
  30. 30.Double 31 =
  31. 31.Double 28 =
  32. 32.Double 61 =
  33. 33.Double 57 =
  34. 34.Double 93 =
  35. 35.Double 49 =
  36. 36.Half of 106 =
  37. 37.Half of 58 =
  38. 38.Double 35 =
  39. 39.Double 29 =
  40. 40.Double 18 =

Answer key

  1. 164
  2. 39
  3. 76
  4. 74
  5. 102
  6. 34
  7. 15
  8. 46
  9. 43
  10. 63
  11. 13
  12. 36
  13. 46
  14. 98
  15. 78
  16. 27
  17. 124
  18. 158
  19. 79
  20. 194
  21. 96
  22. 182
  23. 86
  24. 16
  25. 68
  26. 50
  27. 42
  28. 22
  29. 142
  30. 62
  31. 56
  32. 122
  33. 114
  34. 186
  35. 98
  36. 53
  37. 29
  38. 70
  39. 58
  40. 36

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