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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 846 · 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 23 =
  2. 2.Double 47 =
  3. 3.Half of 184 =
  4. 4.Double 37 =
  5. 5.Half of 150 =
  6. 6.Double 28 =
  7. 7.Double 49 =
  8. 8.Double 36 =
  9. 9.Double 91 =
  10. 10.Half of 102 =
  11. 11.Double 93 =
  12. 12.Half of 154 =
  13. 13.Half of 78 =
  14. 14.Half of 64 =
  15. 15.Double 39 =
  16. 16.Half of 126 =
  17. 17.Double 63 =
  18. 18.Double 46 =
  19. 19.Half of 28 =
  20. 20.Half of 44 =
  21. 21.Double 73 =
  22. 22.Half of 140 =
  23. 23.Half of 122 =
  24. 24.Double 96 =
  25. 25.Double 41 =
  26. 26.Double 81 =
  27. 27.Half of 42 =
  28. 28.Half of 128 =
  29. 29.Half of 192 =
  30. 30.Half of 46 =
  31. 31.Half of 38 =
  32. 32.Half of 56 =
  33. 33.Half of 34 =
  34. 34.Double 83 =
  35. 35.Half of 186 =
  36. 36.Half of 84 =
  37. 37.Double 32 =
  38. 38.Half of 70 =
  39. 39.Double 54 =
  40. 40.Half of 98 =

Answer key

  1. 46
  2. 94
  3. 92
  4. 74
  5. 75
  6. 56
  7. 98
  8. 72
  9. 182
  10. 51
  11. 186
  12. 77
  13. 39
  14. 32
  15. 78
  16. 63
  17. 126
  18. 92
  19. 14
  20. 22
  21. 146
  22. 70
  23. 61
  24. 192
  25. 82
  26. 162
  27. 21
  28. 64
  29. 96
  30. 23
  31. 19
  32. 28
  33. 17
  34. 166
  35. 93
  36. 42
  37. 64
  38. 35
  39. 108
  40. 49

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