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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 826 · 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 85 =
  2. 2.Double 81 =
  3. 3.Double 63 =
  4. 4.Half of 128 =
  5. 5.Half of 198 =
  6. 6.Half of 180 =
  7. 7.Double 61 =
  8. 8.Double 17 =
  9. 9.Double 95 =
  10. 10.Double 65 =
  11. 11.Half of 138 =
  12. 12.Double 56 =
  13. 13.Half of 194 =
  14. 14.Double 41 =
  15. 15.Double 55 =
  16. 16.Half of 56 =
  17. 17.Double 27 =
  18. 18.Half of 32 =
  19. 19.Double 31 =
  20. 20.Double 76 =
  21. 21.Double 49 =
  22. 22.Double 57 =
  23. 23.Half of 106 =
  24. 24.Double 26 =
  25. 25.Double 46 =
  26. 26.Half of 94 =
  27. 27.Half of 148 =
  28. 28.Half of 172 =
  29. 29.Half of 68 =
  30. 30.Double 53 =
  31. 31.Half of 126 =
  32. 32.Double 39 =
  33. 33.Double 38 =
  34. 34.Half of 28 =
  35. 35.Double 32 =
  36. 36.Half of 188 =
  37. 37.Half of 174 =
  38. 38.Double 71 =
  39. 39.Half of 54 =
  40. 40.Double 48 =

Answer key

  1. 170
  2. 162
  3. 126
  4. 64
  5. 99
  6. 90
  7. 122
  8. 34
  9. 190
  10. 130
  11. 69
  12. 112
  13. 97
  14. 82
  15. 110
  16. 28
  17. 54
  18. 16
  19. 62
  20. 152
  21. 98
  22. 114
  23. 53
  24. 52
  25. 92
  26. 47
  27. 74
  28. 86
  29. 34
  30. 106
  31. 63
  32. 78
  33. 76
  34. 14
  35. 64
  36. 94
  37. 87
  38. 142
  39. 27
  40. 96

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