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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 466 · 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 144 =
  2. 2.Half of 188 =
  3. 3.Half of 74 =
  4. 4.Double 82 =
  5. 5.Double 81 =
  6. 6.Half of 190 =
  7. 7.Half of 162 =
  8. 8.Half of 26 =
  9. 9.Double 78 =
  10. 10.Double 34 =
  11. 11.Half of 192 =
  12. 12.Half of 198 =
  13. 13.Double 33 =
  14. 14.Double 77 =
  15. 15.Half of 78 =
  16. 16.Double 19 =
  17. 17.Half of 166 =
  18. 18.Double 71 =
  19. 19.Half of 86 =
  20. 20.Double 41 =
  21. 21.Double 72 =
  22. 22.Double 59 =
  23. 23.Half of 148 =
  24. 24.Double 31 =
  25. 25.Half of 168 =
  26. 26.Double 86 =
  27. 27.Half of 160 =
  28. 28.Double 36 =
  29. 29.Double 76 =
  30. 30.Half of 54 =
  31. 31.Double 48 =
  32. 32.Double 28 =
  33. 33.Double 96 =
  34. 34.Half of 60 =
  35. 35.Double 91 =
  36. 36.Double 38 =
  37. 37.Half of 92 =
  38. 38.Half of 112 =
  39. 39.Half of 110 =
  40. 40.Double 94 =

Answer key

  1. 72
  2. 94
  3. 37
  4. 164
  5. 162
  6. 95
  7. 81
  8. 13
  9. 156
  10. 68
  11. 96
  12. 99
  13. 66
  14. 154
  15. 39
  16. 38
  17. 83
  18. 142
  19. 43
  20. 82
  21. 144
  22. 118
  23. 74
  24. 62
  25. 84
  26. 172
  27. 80
  28. 72
  29. 152
  30. 27
  31. 96
  32. 56
  33. 192
  34. 30
  35. 182
  36. 76
  37. 46
  38. 56
  39. 55
  40. 188

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