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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 139 · 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 58 =
  2. 2.Half of 184 =
  3. 3.Double 91 =
  4. 4.Half of 68 =
  5. 5.Double 74 =
  6. 6.Double 95 =
  7. 7.Double 71 =
  8. 8.Double 75 =
  9. 9.Double 81 =
  10. 10.Double 72 =
  11. 11.Half of 150 =
  12. 12.Double 66 =
  13. 13.Double 39 =
  14. 14.Double 21 =
  15. 15.Half of 168 =
  16. 16.Half of 36 =
  17. 17.Double 37 =
  18. 18.Double 26 =
  19. 19.Double 56 =
  20. 20.Double 24 =
  21. 21.Half of 64 =
  22. 22.Half of 38 =
  23. 23.Half of 122 =
  24. 24.Double 55 =
  25. 25.Half of 28 =
  26. 26.Half of 94 =
  27. 27.Double 29 =
  28. 28.Half of 110 =
  29. 29.Half of 166 =
  30. 30.Double 53 =
  31. 31.Half of 30 =
  32. 32.Half of 138 =
  33. 33.Double 49 =
  34. 34.Half of 98 =
  35. 35.Half of 174 =
  36. 36.Half of 90 =
  37. 37.Half of 100 =
  38. 38.Half of 86 =
  39. 39.Half of 126 =
  40. 40.Half of 40 =

Answer key

  1. 116
  2. 92
  3. 182
  4. 34
  5. 148
  6. 190
  7. 142
  8. 150
  9. 162
  10. 144
  11. 75
  12. 132
  13. 78
  14. 42
  15. 84
  16. 18
  17. 74
  18. 52
  19. 112
  20. 48
  21. 32
  22. 19
  23. 61
  24. 110
  25. 14
  26. 47
  27. 58
  28. 55
  29. 83
  30. 106
  31. 15
  32. 69
  33. 98
  34. 49
  35. 87
  36. 45
  37. 50
  38. 43
  39. 63
  40. 20

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