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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 352 · 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 32 =
  2. 2.Half of 102 =
  3. 3.Double 83 =
  4. 4.Half of 50 =
  5. 5.Half of 178 =
  6. 6.Half of 154 =
  7. 7.Double 56 =
  8. 8.Double 61 =
  9. 9.Double 81 =
  10. 10.Double 29 =
  11. 11.Double 92 =
  12. 12.Half of 30 =
  13. 13.Double 66 =
  14. 14.Double 31 =
  15. 15.Half of 100 =
  16. 16.Double 35 =
  17. 17.Half of 40 =
  18. 18.Half of 34 =
  19. 19.Half of 164 =
  20. 20.Half of 72 =
  21. 21.Double 98 =
  22. 22.Double 74 =
  23. 23.Double 34 =
  24. 24.Double 48 =
  25. 25.Double 82 =
  26. 26.Double 97 =
  27. 27.Double 96 =
  28. 28.Double 89 =
  29. 29.Double 78 =
  30. 30.Half of 116 =
  31. 31.Half of 46 =
  32. 32.Half of 192 =
  33. 33.Double 87 =
  34. 34.Double 41 =
  35. 35.Double 28 =
  36. 36.Half of 188 =
  37. 37.Half of 90 =
  38. 38.Half of 86 =
  39. 39.Double 73 =
  40. 40.Half of 58 =

Answer key

  1. 16
  2. 51
  3. 166
  4. 25
  5. 89
  6. 77
  7. 112
  8. 122
  9. 162
  10. 58
  11. 184
  12. 15
  13. 132
  14. 62
  15. 50
  16. 70
  17. 20
  18. 17
  19. 82
  20. 36
  21. 196
  22. 148
  23. 68
  24. 96
  25. 164
  26. 194
  27. 192
  28. 178
  29. 156
  30. 58
  31. 23
  32. 96
  33. 174
  34. 82
  35. 56
  36. 94
  37. 45
  38. 43
  39. 146
  40. 29

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