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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 867 · 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 118 =
  2. 2.Double 38 =
  3. 3.Double 82 =
  4. 4.Half of 80 =
  5. 5.Half of 72 =
  6. 6.Half of 124 =
  7. 7.Double 91 =
  8. 8.Half of 130 =
  9. 9.Half of 30 =
  10. 10.Double 88 =
  11. 11.Half of 110 =
  12. 12.Double 41 =
  13. 13.Double 48 =
  14. 14.Half of 26 =
  15. 15.Half of 170 =
  16. 16.Double 79 =
  17. 17.Half of 126 =
  18. 18.Double 61 =
  19. 19.Double 32 =
  20. 20.Double 77 =
  21. 21.Double 66 =
  22. 22.Double 22 =
  23. 23.Half of 28 =
  24. 24.Half of 136 =
  25. 25.Double 63 =
  26. 26.Half of 84 =
  27. 27.Double 46 =
  28. 28.Half of 174 =
  29. 29.Double 62 =
  30. 30.Half of 68 =
  31. 31.Half of 42 =
  32. 32.Half of 32 =
  33. 33.Double 33 =
  34. 34.Double 78 =
  35. 35.Half of 122 =
  36. 36.Half of 150 =
  37. 37.Double 44 =
  38. 38.Half of 94 =
  39. 39.Double 73 =
  40. 40.Half of 166 =

Answer key

  1. 59
  2. 76
  3. 164
  4. 40
  5. 36
  6. 62
  7. 182
  8. 65
  9. 15
  10. 176
  11. 55
  12. 82
  13. 96
  14. 13
  15. 85
  16. 158
  17. 63
  18. 122
  19. 64
  20. 154
  21. 132
  22. 44
  23. 14
  24. 68
  25. 126
  26. 42
  27. 92
  28. 87
  29. 124
  30. 34
  31. 21
  32. 16
  33. 66
  34. 156
  35. 61
  36. 75
  37. 88
  38. 47
  39. 146
  40. 83

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