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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 435 · 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 72 =
  2. 2.Double 79 =
  3. 3.Double 32 =
  4. 4.Double 81 =
  5. 5.Double 19 =
  6. 6.Double 23 =
  7. 7.Double 51 =
  8. 8.Double 37 =
  9. 9.Half of 144 =
  10. 10.Double 61 =
  11. 11.Half of 34 =
  12. 12.Double 94 =
  13. 13.Half of 26 =
  14. 14.Double 48 =
  15. 15.Half of 58 =
  16. 16.Double 71 =
  17. 17.Double 74 =
  18. 18.Double 18 =
  19. 19.Double 84 =
  20. 20.Double 57 =
  21. 21.Double 34 =
  22. 22.Half of 42 =
  23. 23.Half of 102 =
  24. 24.Double 28 =
  25. 25.Half of 28 =
  26. 26.Double 83 =
  27. 27.Half of 30 =
  28. 28.Double 43 =
  29. 29.Double 73 =
  30. 30.Half of 88 =
  31. 31.Half of 138 =
  32. 32.Half of 96 =
  33. 33.Double 82 =
  34. 34.Half of 60 =
  35. 35.Half of 38 =
  36. 36.Half of 196 =
  37. 37.Double 91 =
  38. 38.Half of 150 =
  39. 39.Half of 128 =
  40. 40.Half of 198 =

Answer key

  1. 36
  2. 158
  3. 64
  4. 162
  5. 38
  6. 46
  7. 102
  8. 74
  9. 72
  10. 122
  11. 17
  12. 188
  13. 13
  14. 96
  15. 29
  16. 142
  17. 148
  18. 36
  19. 168
  20. 114
  21. 68
  22. 21
  23. 51
  24. 56
  25. 14
  26. 166
  27. 15
  28. 86
  29. 146
  30. 44
  31. 69
  32. 48
  33. 164
  34. 30
  35. 19
  36. 98
  37. 182
  38. 75
  39. 64
  40. 99

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