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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 234 · 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.Double 58 =
  2. 2.Double 88 =
  3. 3.Half of 38 =
  4. 4.Half of 108 =
  5. 5.Half of 186 =
  6. 6.Double 33 =
  7. 7.Half of 70 =
  8. 8.Double 38 =
  9. 9.Double 26 =
  10. 10.Half of 148 =
  11. 11.Half of 140 =
  12. 12.Double 89 =
  13. 13.Double 93 =
  14. 14.Double 41 =
  15. 15.Double 71 =
  16. 16.Double 73 =
  17. 17.Double 25 =
  18. 18.Double 31 =
  19. 19.Half of 110 =
  20. 20.Half of 26 =
  21. 21.Half of 168 =
  22. 22.Half of 112 =
  23. 23.Double 67 =
  24. 24.Half of 48 =
  25. 25.Double 49 =
  26. 26.Double 46 =
  27. 27.Half of 64 =
  28. 28.Half of 82 =
  29. 29.Double 87 =
  30. 30.Half of 78 =
  31. 31.Double 57 =
  32. 32.Half of 74 =
  33. 33.Half of 146 =
  34. 34.Half of 128 =
  35. 35.Half of 130 =
  36. 36.Half of 52 =
  37. 37.Half of 162 =
  38. 38.Half of 126 =
  39. 39.Double 43 =
  40. 40.Half of 182 =

Answer key

  1. 116
  2. 176
  3. 19
  4. 54
  5. 93
  6. 66
  7. 35
  8. 76
  9. 52
  10. 74
  11. 70
  12. 178
  13. 186
  14. 82
  15. 142
  16. 146
  17. 50
  18. 62
  19. 55
  20. 13
  21. 84
  22. 56
  23. 134
  24. 24
  25. 98
  26. 92
  27. 32
  28. 41
  29. 174
  30. 39
  31. 114
  32. 37
  33. 73
  34. 64
  35. 65
  36. 26
  37. 81
  38. 63
  39. 86
  40. 91

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