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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 113 · 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 188 =
  2. 2.Half of 126 =
  3. 3.Half of 38 =
  4. 4.Double 77 =
  5. 5.Double 44 =
  6. 6.Double 62 =
  7. 7.Double 97 =
  8. 8.Double 81 =
  9. 9.Half of 54 =
  10. 10.Half of 156 =
  11. 11.Half of 64 =
  12. 12.Double 42 =
  13. 13.Double 41 =
  14. 14.Half of 52 =
  15. 15.Double 66 =
  16. 16.Double 36 =
  17. 17.Double 37 =
  18. 18.Double 86 =
  19. 19.Half of 136 =
  20. 20.Half of 58 =
  21. 21.Half of 90 =
  22. 22.Half of 78 =
  23. 23.Double 71 =
  24. 24.Double 25 =
  25. 25.Double 22 =
  26. 26.Double 21 =
  27. 27.Double 27 =
  28. 28.Double 91 =
  29. 29.Double 29 =
  30. 30.Double 73 =
  31. 31.Half of 34 =
  32. 32.Half of 176 =
  33. 33.Double 31 =
  34. 34.Half of 30 =
  35. 35.Double 17 =
  36. 36.Double 72 =
  37. 37.Half of 164 =
  38. 38.Double 32 =
  39. 39.Half of 198 =
  40. 40.Double 47 =

Answer key

  1. 94
  2. 63
  3. 19
  4. 154
  5. 88
  6. 124
  7. 194
  8. 162
  9. 27
  10. 78
  11. 32
  12. 84
  13. 82
  14. 26
  15. 132
  16. 72
  17. 74
  18. 172
  19. 68
  20. 29
  21. 45
  22. 39
  23. 142
  24. 50
  25. 44
  26. 42
  27. 54
  28. 182
  29. 58
  30. 146
  31. 17
  32. 88
  33. 62
  34. 15
  35. 34
  36. 144
  37. 82
  38. 64
  39. 99
  40. 94

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