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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 285 · 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 56 =
  2. 2.Half of 44 =
  3. 3.Double 72 =
  4. 4.Half of 66 =
  5. 5.Double 82 =
  6. 6.Half of 140 =
  7. 7.Double 46 =
  8. 8.Half of 88 =
  9. 9.Half of 126 =
  10. 10.Double 91 =
  11. 11.Half of 192 =
  12. 12.Half of 166 =
  13. 13.Double 26 =
  14. 14.Double 37 =
  15. 15.Double 44 =
  16. 16.Double 21 =
  17. 17.Half of 190 =
  18. 18.Double 75 =
  19. 19.Half of 174 =
  20. 20.Double 67 =
  21. 21.Half of 122 =
  22. 22.Double 17 =
  23. 23.Double 34 =
  24. 24.Half of 100 =
  25. 25.Half of 146 =
  26. 26.Double 19 =
  27. 27.Double 57 =
  28. 28.Half of 74 =
  29. 29.Half of 60 =
  30. 30.Double 47 =
  31. 31.Half of 130 =
  32. 32.Double 41 =
  33. 33.Half of 172 =
  34. 34.Double 78 =
  35. 35.Half of 98 =
  36. 36.Double 29 =
  37. 37.Half of 162 =
  38. 38.Half of 138 =
  39. 39.Double 31 =
  40. 40.Double 97 =

Answer key

  1. 28
  2. 22
  3. 144
  4. 33
  5. 164
  6. 70
  7. 92
  8. 44
  9. 63
  10. 182
  11. 96
  12. 83
  13. 52
  14. 74
  15. 88
  16. 42
  17. 95
  18. 150
  19. 87
  20. 134
  21. 61
  22. 34
  23. 68
  24. 50
  25. 73
  26. 38
  27. 114
  28. 37
  29. 30
  30. 94
  31. 65
  32. 82
  33. 86
  34. 156
  35. 49
  36. 58
  37. 81
  38. 69
  39. 62
  40. 194

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