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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 952 · 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 130 =
  2. 2.Double 39 =
  3. 3.Half of 60 =
  4. 4.Half of 68 =
  5. 5.Double 61 =
  6. 6.Double 83 =
  7. 7.Double 64 =
  8. 8.Half of 114 =
  9. 9.Double 56 =
  10. 10.Double 45 =
  11. 11.Half of 42 =
  12. 12.Double 73 =
  13. 13.Half of 78 =
  14. 14.Half of 116 =
  15. 15.Half of 82 =
  16. 16.Double 51 =
  17. 17.Half of 38 =
  18. 18.Double 89 =
  19. 19.Double 34 =
  20. 20.Double 41 =
  21. 21.Double 55 =
  22. 22.Double 31 =
  23. 23.Double 32 =
  24. 24.Half of 136 =
  25. 25.Half of 70 =
  26. 26.Half of 122 =
  27. 27.Double 44 =
  28. 28.Double 87 =
  29. 29.Double 62 =
  30. 30.Double 43 =
  31. 31.Double 28 =
  32. 32.Half of 64 =
  33. 33.Double 97 =
  34. 34.Half of 94 =
  35. 35.Half of 72 =
  36. 36.Double 67 =
  37. 37.Double 91 =
  38. 38.Double 77 =
  39. 39.Half of 46 =
  40. 40.Double 21 =

Answer key

  1. 65
  2. 78
  3. 30
  4. 34
  5. 122
  6. 166
  7. 128
  8. 57
  9. 112
  10. 90
  11. 21
  12. 146
  13. 39
  14. 58
  15. 41
  16. 102
  17. 19
  18. 178
  19. 68
  20. 82
  21. 110
  22. 62
  23. 64
  24. 68
  25. 35
  26. 61
  27. 88
  28. 174
  29. 124
  30. 86
  31. 56
  32. 32
  33. 194
  34. 47
  35. 36
  36. 134
  37. 182
  38. 154
  39. 23
  40. 42

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