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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 501 · 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 75 =
  2. 2.Double 41 =
  3. 3.Double 37 =
  4. 4.Double 86 =
  5. 5.Half of 114 =
  6. 6.Double 18 =
  7. 7.Half of 148 =
  8. 8.Double 16 =
  9. 9.Half of 134 =
  10. 10.Double 93 =
  11. 11.Double 39 =
  12. 12.Double 34 =
  13. 13.Double 77 =
  14. 14.Double 83 =
  15. 15.Half of 102 =
  16. 16.Half of 122 =
  17. 17.Double 52 =
  18. 18.Half of 76 =
  19. 19.Half of 170 =
  20. 20.Half of 72 =
  21. 21.Half of 98 =
  22. 22.Double 61 =
  23. 23.Half of 34 =
  24. 24.Double 26 =
  25. 25.Half of 68 =
  26. 26.Double 56 =
  27. 27.Double 32 =
  28. 28.Half of 120 =
  29. 29.Double 65 =
  30. 30.Double 55 =
  31. 31.Half of 112 =
  32. 32.Half of 36 =
  33. 33.Double 44 =
  34. 34.Double 71 =
  35. 35.Half of 66 =
  36. 36.Half of 40 =
  37. 37.Half of 118 =
  38. 38.Half of 82 =
  39. 39.Half of 90 =
  40. 40.Half of 74 =

Answer key

  1. 150
  2. 82
  3. 74
  4. 172
  5. 57
  6. 36
  7. 74
  8. 32
  9. 67
  10. 186
  11. 78
  12. 68
  13. 154
  14. 166
  15. 51
  16. 61
  17. 104
  18. 38
  19. 85
  20. 36
  21. 49
  22. 122
  23. 17
  24. 52
  25. 34
  26. 112
  27. 64
  28. 60
  29. 130
  30. 110
  31. 56
  32. 18
  33. 88
  34. 142
  35. 33
  36. 20
  37. 59
  38. 41
  39. 45
  40. 37

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