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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 905 · 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 69 =
  2. 2.Double 91 =
  3. 3.Double 87 =
  4. 4.Double 83 =
  5. 5.Half of 72 =
  6. 6.Double 67 =
  7. 7.Half of 188 =
  8. 8.Double 31 =
  9. 9.Half of 78 =
  10. 10.Double 17 =
  11. 11.Half of 50 =
  12. 12.Half of 174 =
  13. 13.Half of 126 =
  14. 14.Double 45 =
  15. 15.Half of 102 =
  16. 16.Half of 26 =
  17. 17.Double 77 =
  18. 18.Double 41 =
  19. 19.Half of 46 =
  20. 20.Double 24 =
  21. 21.Double 27 =
  22. 22.Double 97 =
  23. 23.Half of 34 =
  24. 24.Half of 172 =
  25. 25.Half of 134 =
  26. 26.Double 54 =
  27. 27.Double 84 =
  28. 28.Half of 152 =
  29. 29.Half of 84 =
  30. 30.Double 55 =
  31. 31.Half of 30 =
  32. 32.Half of 164 =
  33. 33.Double 39 =
  34. 34.Half of 146 =
  35. 35.Double 32 =
  36. 36.Double 78 =
  37. 37.Half of 140 =
  38. 38.Double 59 =
  39. 39.Double 82 =
  40. 40.Double 57 =

Answer key

  1. 138
  2. 182
  3. 174
  4. 166
  5. 36
  6. 134
  7. 94
  8. 62
  9. 39
  10. 34
  11. 25
  12. 87
  13. 63
  14. 90
  15. 51
  16. 13
  17. 154
  18. 82
  19. 23
  20. 48
  21. 54
  22. 194
  23. 17
  24. 86
  25. 67
  26. 108
  27. 168
  28. 76
  29. 42
  30. 110
  31. 15
  32. 82
  33. 78
  34. 73
  35. 64
  36. 156
  37. 70
  38. 118
  39. 164
  40. 114

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