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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 796 · 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 94 =
  2. 2.Half of 52 =
  3. 3.Double 26 =
  4. 4.Double 61 =
  5. 5.Double 21 =
  6. 6.Double 41 =
  7. 7.Double 96 =
  8. 8.Double 17 =
  9. 9.Double 23 =
  10. 10.Half of 78 =
  11. 11.Double 83 =
  12. 12.Double 44 =
  13. 13.Half of 154 =
  14. 14.Double 22 =
  15. 15.Half of 48 =
  16. 16.Double 25 =
  17. 17.Double 76 =
  18. 18.Double 98 =
  19. 19.Half of 34 =
  20. 20.Double 71 =
  21. 21.Double 45 =
  22. 22.Half of 82 =
  23. 23.Half of 192 =
  24. 24.Double 27 =
  25. 25.Double 63 =
  26. 26.Double 79 =
  27. 27.Half of 100 =
  28. 28.Double 93 =
  29. 29.Half of 182 =
  30. 30.Double 36 =
  31. 31.Half of 44 =
  32. 32.Double 59 =
  33. 33.Half of 122 =
  34. 34.Half of 128 =
  35. 35.Half of 162 =
  36. 36.Half of 28 =
  37. 37.Half of 72 =
  38. 38.Double 38 =
  39. 39.Double 77 =
  40. 40.Double 54 =

Answer key

  1. 47
  2. 26
  3. 52
  4. 122
  5. 42
  6. 82
  7. 192
  8. 34
  9. 46
  10. 39
  11. 166
  12. 88
  13. 77
  14. 44
  15. 24
  16. 50
  17. 152
  18. 196
  19. 17
  20. 142
  21. 90
  22. 41
  23. 96
  24. 54
  25. 126
  26. 158
  27. 50
  28. 186
  29. 91
  30. 72
  31. 22
  32. 118
  33. 61
  34. 64
  35. 81
  36. 14
  37. 36
  38. 76
  39. 154
  40. 108

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