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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 413 · 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 29 =
  2. 2.Half of 150 =
  3. 3.Half of 156 =
  4. 4.Double 18 =
  5. 5.Double 33 =
  6. 6.Double 22 =
  7. 7.Double 53 =
  8. 8.Double 21 =
  9. 9.Double 62 =
  10. 10.Double 75 =
  11. 11.Half of 104 =
  12. 12.Double 78 =
  13. 13.Half of 126 =
  14. 14.Double 89 =
  15. 15.Half of 84 =
  16. 16.Half of 48 =
  17. 17.Double 61 =
  18. 18.Half of 82 =
  19. 19.Double 37 =
  20. 20.Half of 74 =
  21. 21.Half of 52 =
  22. 22.Double 79 =
  23. 23.Half of 178 =
  24. 24.Half of 100 =
  25. 25.Half of 138 =
  26. 26.Half of 44 =
  27. 27.Double 58 =
  28. 28.Half of 152 =
  29. 29.Double 51 =
  30. 30.Half of 66 =
  31. 31.Double 41 =
  32. 32.Double 16 =
  33. 33.Double 39 =
  34. 34.Half of 64 =
  35. 35.Double 81 =
  36. 36.Half of 76 =
  37. 37.Double 88 =
  38. 38.Half of 92 =
  39. 39.Double 91 =
  40. 40.Half of 114 =

Answer key

  1. 58
  2. 75
  3. 78
  4. 36
  5. 66
  6. 44
  7. 106
  8. 42
  9. 124
  10. 150
  11. 52
  12. 156
  13. 63
  14. 178
  15. 42
  16. 24
  17. 122
  18. 41
  19. 74
  20. 37
  21. 26
  22. 158
  23. 89
  24. 50
  25. 69
  26. 22
  27. 116
  28. 76
  29. 102
  30. 33
  31. 82
  32. 32
  33. 78
  34. 32
  35. 162
  36. 38
  37. 176
  38. 46
  39. 182
  40. 57

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