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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 342 · 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 24 =
  2. 2.Half of 106 =
  3. 3.Half of 38 =
  4. 4.Half of 54 =
  5. 5.Double 38 =
  6. 6.Double 73 =
  7. 7.Half of 198 =
  8. 8.Half of 144 =
  9. 9.Half of 116 =
  10. 10.Half of 140 =
  11. 11.Half of 92 =
  12. 12.Half of 102 =
  13. 13.Half of 122 =
  14. 14.Half of 50 =
  15. 15.Double 28 =
  16. 16.Double 91 =
  17. 17.Half of 60 =
  18. 18.Double 95 =
  19. 19.Double 71 =
  20. 20.Double 53 =
  21. 21.Double 23 =
  22. 22.Half of 36 =
  23. 23.Double 37 =
  24. 24.Half of 162 =
  25. 25.Double 31 =
  26. 26.Half of 180 =
  27. 27.Double 93 =
  28. 28.Half of 28 =
  29. 29.Half of 172 =
  30. 30.Half of 64 =
  31. 31.Double 96 =
  32. 32.Double 83 =
  33. 33.Double 64 =
  34. 34.Double 29 =
  35. 35.Double 85 =
  36. 36.Half of 72 =
  37. 37.Half of 66 =
  38. 38.Half of 126 =
  39. 39.Double 62 =
  40. 40.Double 45 =

Answer key

  1. 48
  2. 53
  3. 19
  4. 27
  5. 76
  6. 146
  7. 99
  8. 72
  9. 58
  10. 70
  11. 46
  12. 51
  13. 61
  14. 25
  15. 56
  16. 182
  17. 30
  18. 190
  19. 142
  20. 106
  21. 46
  22. 18
  23. 74
  24. 81
  25. 62
  26. 90
  27. 186
  28. 14
  29. 86
  30. 32
  31. 192
  32. 166
  33. 128
  34. 58
  35. 170
  36. 36
  37. 33
  38. 63
  39. 124
  40. 90

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