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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 443 · 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 184 =
  2. 2.Double 43 =
  3. 3.Double 33 =
  4. 4.Double 24 =
  5. 5.Double 86 =
  6. 6.Half of 150 =
  7. 7.Half of 30 =
  8. 8.Double 89 =
  9. 9.Double 37 =
  10. 10.Half of 74 =
  11. 11.Double 47 =
  12. 12.Double 17 =
  13. 13.Half of 122 =
  14. 14.Double 27 =
  15. 15.Half of 50 =
  16. 16.Double 38 =
  17. 17.Half of 46 =
  18. 18.Half of 188 =
  19. 19.Half of 134 =
  20. 20.Half of 130 =
  21. 21.Half of 154 =
  22. 22.Double 41 =
  23. 23.Double 71 =
  24. 24.Double 91 =
  25. 25.Double 69 =
  26. 26.Half of 166 =
  27. 27.Double 48 =
  28. 28.Double 23 =
  29. 29.Half of 108 =
  30. 30.Half of 72 =
  31. 31.Double 18 =
  32. 32.Half of 48 =
  33. 33.Double 93 =
  34. 34.Double 16 =
  35. 35.Half of 146 =
  36. 36.Double 99 =
  37. 37.Double 51 =
  38. 38.Double 59 =
  39. 39.Half of 82 =
  40. 40.Double 83 =

Answer key

  1. 92
  2. 86
  3. 66
  4. 48
  5. 172
  6. 75
  7. 15
  8. 178
  9. 74
  10. 37
  11. 94
  12. 34
  13. 61
  14. 54
  15. 25
  16. 76
  17. 23
  18. 94
  19. 67
  20. 65
  21. 77
  22. 82
  23. 142
  24. 182
  25. 138
  26. 83
  27. 96
  28. 46
  29. 54
  30. 36
  31. 36
  32. 24
  33. 186
  34. 32
  35. 73
  36. 198
  37. 102
  38. 118
  39. 41
  40. 166

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