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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 440 · 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 54 =
  2. 2.Half of 184 =
  3. 3.Half of 150 =
  4. 4.Double 24 =
  5. 5.Half of 70 =
  6. 6.Double 57 =
  7. 7.Double 59 =
  8. 8.Half of 116 =
  9. 9.Double 23 =
  10. 10.Double 52 =
  11. 11.Double 41 =
  12. 12.Double 71 =
  13. 13.Double 35 =
  14. 14.Half of 74 =
  15. 15.Half of 78 =
  16. 16.Half of 38 =
  17. 17.Double 25 =
  18. 18.Half of 102 =
  19. 19.Double 32 =
  20. 20.Double 84 =
  21. 21.Half of 188 =
  22. 22.Double 97 =
  23. 23.Half of 36 =
  24. 24.Half of 58 =
  25. 25.Half of 196 =
  26. 26.Double 62 =
  27. 27.Half of 52 =
  28. 28.Half of 26 =
  29. 29.Double 53 =
  30. 30.Double 75 =
  31. 31.Double 31 =
  32. 32.Double 21 =
  33. 33.Half of 40 =
  34. 34.Double 95 =
  35. 35.Half of 110 =
  36. 36.Double 82 =
  37. 37.Half of 66 =
  38. 38.Half of 138 =
  39. 39.Double 72 =
  40. 40.Half of 130 =

Answer key

  1. 108
  2. 92
  3. 75
  4. 48
  5. 35
  6. 114
  7. 118
  8. 58
  9. 46
  10. 104
  11. 82
  12. 142
  13. 70
  14. 37
  15. 39
  16. 19
  17. 50
  18. 51
  19. 64
  20. 168
  21. 94
  22. 194
  23. 18
  24. 29
  25. 98
  26. 124
  27. 26
  28. 13
  29. 106
  30. 150
  31. 62
  32. 42
  33. 20
  34. 190
  35. 55
  36. 164
  37. 33
  38. 69
  39. 144
  40. 65

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