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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 478 · 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 47 =
  2. 2.Double 81 =
  3. 3.Double 72 =
  4. 4.Half of 114 =
  5. 5.Double 56 =
  6. 6.Half of 164 =
  7. 7.Half of 60 =
  8. 8.Double 86 =
  9. 9.Double 79 =
  10. 10.Half of 160 =
  11. 11.Double 85 =
  12. 12.Double 66 =
  13. 13.Half of 58 =
  14. 14.Double 71 =
  15. 15.Half of 184 =
  16. 16.Double 75 =
  17. 17.Half of 188 =
  18. 18.Double 21 =
  19. 19.Double 52 =
  20. 20.Double 54 =
  21. 21.Half of 154 =
  22. 22.Half of 182 =
  23. 23.Double 73 =
  24. 24.Double 87 =
  25. 25.Double 62 =
  26. 26.Half of 106 =
  27. 27.Half of 192 =
  28. 28.Double 26 =
  29. 29.Half of 104 =
  30. 30.Half of 190 =
  31. 31.Half of 194 =
  32. 32.Double 45 =
  33. 33.Double 95 =
  34. 34.Half of 102 =
  35. 35.Half of 158 =
  36. 36.Half of 64 =
  37. 37.Half of 110 =
  38. 38.Double 59 =
  39. 39.Half of 96 =
  40. 40.Half of 168 =

Answer key

  1. 94
  2. 162
  3. 144
  4. 57
  5. 112
  6. 82
  7. 30
  8. 172
  9. 158
  10. 80
  11. 170
  12. 132
  13. 29
  14. 142
  15. 92
  16. 150
  17. 94
  18. 42
  19. 104
  20. 108
  21. 77
  22. 91
  23. 146
  24. 174
  25. 124
  26. 53
  27. 96
  28. 52
  29. 52
  30. 95
  31. 97
  32. 90
  33. 190
  34. 51
  35. 79
  36. 32
  37. 55
  38. 118
  39. 48
  40. 84

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