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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 91 · 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 32 =
  2. 2.Double 25 =
  3. 3.Half of 142 =
  4. 4.Double 63 =
  5. 5.Double 59 =
  6. 6.Double 21 =
  7. 7.Half of 174 =
  8. 8.Half of 126 =
  9. 9.Double 67 =
  10. 10.Half of 62 =
  11. 11.Half of 192 =
  12. 12.Double 35 =
  13. 13.Double 91 =
  14. 14.Half of 26 =
  15. 15.Half of 60 =
  16. 16.Half of 38 =
  17. 17.Half of 144 =
  18. 18.Double 64 =
  19. 19.Double 77 =
  20. 20.Double 84 =
  21. 21.Double 39 =
  22. 22.Double 33 =
  23. 23.Double 46 =
  24. 24.Double 28 =
  25. 25.Half of 108 =
  26. 26.Half of 54 =
  27. 27.Double 75 =
  28. 28.Double 41 =
  29. 29.Half of 72 =
  30. 30.Half of 96 =
  31. 31.Double 49 =
  32. 32.Double 78 =
  33. 33.Half of 114 =
  34. 34.Double 81 =
  35. 35.Double 96 =
  36. 36.Half of 64 =
  37. 37.Half of 112 =
  38. 38.Half of 30 =
  39. 39.Half of 172 =
  40. 40.Double 52 =

Answer key

  1. 64
  2. 50
  3. 71
  4. 126
  5. 118
  6. 42
  7. 87
  8. 63
  9. 134
  10. 31
  11. 96
  12. 70
  13. 182
  14. 13
  15. 30
  16. 19
  17. 72
  18. 128
  19. 154
  20. 168
  21. 78
  22. 66
  23. 92
  24. 56
  25. 54
  26. 27
  27. 150
  28. 82
  29. 36
  30. 48
  31. 98
  32. 156
  33. 57
  34. 162
  35. 192
  36. 32
  37. 56
  38. 15
  39. 86
  40. 104

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