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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 339 · 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 166 =
  2. 2.Double 21 =
  3. 3.Half of 134 =
  4. 4.Double 81 =
  5. 5.Double 61 =
  6. 6.Double 98 =
  7. 7.Double 42 =
  8. 8.Double 31 =
  9. 9.Double 96 =
  10. 10.Half of 196 =
  11. 11.Double 27 =
  12. 12.Double 97 =
  13. 13.Half of 54 =
  14. 14.Double 51 =
  15. 15.Double 22 =
  16. 16.Half of 162 =
  17. 17.Double 86 =
  18. 18.Double 71 =
  19. 19.Double 64 =
  20. 20.Double 56 =
  21. 21.Half of 70 =
  22. 22.Half of 130 =
  23. 23.Half of 132 =
  24. 24.Double 37 =
  25. 25.Double 88 =
  26. 26.Half of 74 =
  27. 27.Double 35 =
  28. 28.Double 54 =
  29. 29.Double 28 =
  30. 30.Half of 118 =
  31. 31.Half of 168 =
  32. 32.Double 78 =
  33. 33.Double 65 =
  34. 34.Half of 186 =
  35. 35.Half of 154 =
  36. 36.Half of 56 =
  37. 37.Half of 170 =
  38. 38.Half of 58 =
  39. 39.Half of 198 =
  40. 40.Half of 98 =

Answer key

  1. 83
  2. 42
  3. 67
  4. 162
  5. 122
  6. 196
  7. 84
  8. 62
  9. 192
  10. 98
  11. 54
  12. 194
  13. 27
  14. 102
  15. 44
  16. 81
  17. 172
  18. 142
  19. 128
  20. 112
  21. 35
  22. 65
  23. 66
  24. 74
  25. 176
  26. 37
  27. 70
  28. 108
  29. 56
  30. 59
  31. 84
  32. 156
  33. 130
  34. 93
  35. 77
  36. 28
  37. 85
  38. 29
  39. 99
  40. 49

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