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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 333 · 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.Half of 72 =
  2. 2.Double 28 =
  3. 3.Double 57 =
  4. 4.Double 41 =
  5. 5.Double 77 =
  6. 6.Half of 170 =
  7. 7.Half of 100 =
  8. 8.Half of 94 =
  9. 9.Half of 184 =
  10. 10.Double 81 =
  11. 11.Double 76 =
  12. 12.Half of 70 =
  13. 13.Double 84 =
  14. 14.Double 33 =
  15. 15.Half of 56 =
  16. 16.Half of 68 =
  17. 17.Double 68 =
  18. 18.Double 62 =
  19. 19.Double 21 =
  20. 20.Half of 44 =
  21. 21.Half of 52 =
  22. 22.Half of 144 =
  23. 23.Double 34 =
  24. 24.Double 59 =
  25. 25.Half of 132 =
  26. 26.Half of 174 =
  27. 27.Half of 134 =
  28. 28.Half of 138 =
  29. 29.Double 64 =
  30. 30.Half of 126 =
  31. 31.Double 27 =
  32. 32.Half of 116 =
  33. 33.Double 56 =
  34. 34.Double 32 =
  35. 35.Double 66 =
  36. 36.Double 63 =
  37. 37.Half of 50 =
  38. 38.Half of 146 =
  39. 39.Half of 168 =
  40. 40.Double 89 =

Answer key

  1. 36
  2. 56
  3. 114
  4. 82
  5. 154
  6. 85
  7. 50
  8. 47
  9. 92
  10. 162
  11. 152
  12. 35
  13. 168
  14. 66
  15. 28
  16. 34
  17. 136
  18. 124
  19. 42
  20. 22
  21. 26
  22. 72
  23. 68
  24. 118
  25. 66
  26. 87
  27. 67
  28. 69
  29. 128
  30. 63
  31. 54
  32. 58
  33. 112
  34. 64
  35. 132
  36. 126
  37. 25
  38. 73
  39. 84
  40. 178

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