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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 576 · 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 162 =
  2. 2.Half of 184 =
  3. 3.Half of 124 =
  4. 4.Half of 44 =
  5. 5.Half of 120 =
  6. 6.Double 91 =
  7. 7.Double 33 =
  8. 8.Half of 166 =
  9. 9.Double 99 =
  10. 10.Double 31 =
  11. 11.Half of 28 =
  12. 12.Double 52 =
  13. 13.Half of 30 =
  14. 14.Double 81 =
  15. 15.Double 54 =
  16. 16.Double 28 =
  17. 17.Half of 116 =
  18. 18.Double 17 =
  19. 19.Double 97 =
  20. 20.Half of 160 =
  21. 21.Half of 186 =
  22. 22.Double 73 =
  23. 23.Double 61 =
  24. 24.Double 18 =
  25. 25.Half of 50 =
  26. 26.Half of 108 =
  27. 27.Half of 140 =
  28. 28.Half of 52 =
  29. 29.Double 26 =
  30. 30.Double 96 =
  31. 31.Double 84 =
  32. 32.Double 77 =
  33. 33.Double 56 =
  34. 34.Double 49 =
  35. 35.Half of 164 =
  36. 36.Double 48 =
  37. 37.Double 71 =
  38. 38.Double 41 =
  39. 39.Half of 148 =
  40. 40.Double 23 =

Answer key

  1. 81
  2. 92
  3. 62
  4. 22
  5. 60
  6. 182
  7. 66
  8. 83
  9. 198
  10. 62
  11. 14
  12. 104
  13. 15
  14. 162
  15. 108
  16. 56
  17. 58
  18. 34
  19. 194
  20. 80
  21. 93
  22. 146
  23. 122
  24. 36
  25. 25
  26. 54
  27. 70
  28. 26
  29. 52
  30. 192
  31. 168
  32. 154
  33. 112
  34. 98
  35. 82
  36. 96
  37. 142
  38. 82
  39. 74
  40. 46

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