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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 975 · 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 38 =
  2. 2.Half of 86 =
  3. 3.Double 91 =
  4. 4.Half of 106 =
  5. 5.Double 53 =
  6. 6.Double 51 =
  7. 7.Half of 38 =
  8. 8.Half of 182 =
  9. 9.Half of 50 =
  10. 10.Double 84 =
  11. 11.Half of 128 =
  12. 12.Half of 32 =
  13. 13.Half of 114 =
  14. 14.Double 44 =
  15. 15.Double 18 =
  16. 16.Double 71 =
  17. 17.Half of 194 =
  18. 18.Double 68 =
  19. 19.Double 23 =
  20. 20.Half of 166 =
  21. 21.Half of 124 =
  22. 22.Half of 78 =
  23. 23.Half of 136 =
  24. 24.Double 45 =
  25. 25.Double 95 =
  26. 26.Double 32 =
  27. 27.Half of 26 =
  28. 28.Double 76 =
  29. 29.Half of 46 =
  30. 30.Half of 162 =
  31. 31.Double 81 =
  32. 32.Half of 138 =
  33. 33.Half of 134 =
  34. 34.Double 67 =
  35. 35.Half of 142 =
  36. 36.Double 88 =
  37. 37.Double 48 =
  38. 38.Double 54 =
  39. 39.Half of 76 =
  40. 40.Half of 170 =

Answer key

  1. 76
  2. 43
  3. 182
  4. 53
  5. 106
  6. 102
  7. 19
  8. 91
  9. 25
  10. 168
  11. 64
  12. 16
  13. 57
  14. 88
  15. 36
  16. 142
  17. 97
  18. 136
  19. 46
  20. 83
  21. 62
  22. 39
  23. 68
  24. 90
  25. 190
  26. 64
  27. 13
  28. 152
  29. 23
  30. 81
  31. 162
  32. 69
  33. 67
  34. 134
  35. 71
  36. 176
  37. 96
  38. 108
  39. 38
  40. 85

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