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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 323 · 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 66 =
  2. 2.Half of 88 =
  3. 3.Double 26 =
  4. 4.Half of 162 =
  5. 5.Half of 190 =
  6. 6.Half of 60 =
  7. 7.Double 84 =
  8. 8.Double 41 =
  9. 9.Double 61 =
  10. 10.Double 36 =
  11. 11.Half of 178 =
  12. 12.Double 23 =
  13. 13.Half of 64 =
  14. 14.Half of 74 =
  15. 15.Double 88 =
  16. 16.Double 98 =
  17. 17.Double 32 =
  18. 18.Double 91 =
  19. 19.Double 54 =
  20. 20.Half of 186 =
  21. 21.Half of 188 =
  22. 22.Double 85 =
  23. 23.Double 47 =
  24. 24.Double 34 =
  25. 25.Double 78 =
  26. 26.Double 55 =
  27. 27.Half of 90 =
  28. 28.Double 89 =
  29. 29.Half of 86 =
  30. 30.Double 44 =
  31. 31.Half of 124 =
  32. 32.Half of 172 =
  33. 33.Half of 82 =
  34. 34.Double 31 =
  35. 35.Double 42 =
  36. 36.Double 17 =
  37. 37.Half of 54 =
  38. 38.Double 51 =
  39. 39.Double 48 =
  40. 40.Double 82 =

Answer key

  1. 33
  2. 44
  3. 52
  4. 81
  5. 95
  6. 30
  7. 168
  8. 82
  9. 122
  10. 72
  11. 89
  12. 46
  13. 32
  14. 37
  15. 176
  16. 196
  17. 64
  18. 182
  19. 108
  20. 93
  21. 94
  22. 170
  23. 94
  24. 68
  25. 156
  26. 110
  27. 45
  28. 178
  29. 43
  30. 88
  31. 62
  32. 86
  33. 41
  34. 62
  35. 84
  36. 34
  37. 27
  38. 102
  39. 96
  40. 164

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