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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 865 · 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 96 =
  2. 2.Half of 58 =
  3. 3.Double 72 =
  4. 4.Half of 150 =
  5. 5.Double 56 =
  6. 6.Half of 62 =
  7. 7.Half of 124 =
  8. 8.Double 81 =
  9. 9.Double 93 =
  10. 10.Double 61 =
  11. 11.Double 41 =
  12. 12.Half of 104 =
  13. 13.Double 16 =
  14. 14.Double 65 =
  15. 15.Half of 184 =
  16. 16.Half of 48 =
  17. 17.Half of 154 =
  18. 18.Double 91 =
  19. 19.Half of 166 =
  20. 20.Half of 72 =
  21. 21.Double 58 =
  22. 22.Double 25 =
  23. 23.Double 24 =
  24. 24.Half of 60 =
  25. 25.Half of 126 =
  26. 26.Half of 132 =
  27. 27.Half of 66 =
  28. 28.Half of 156 =
  29. 29.Half of 82 =
  30. 30.Half of 158 =
  31. 31.Half of 40 =
  32. 32.Half of 50 =
  33. 33.Half of 144 =
  34. 34.Half of 110 =
  35. 35.Double 29 =
  36. 36.Double 68 =
  37. 37.Half of 92 =
  38. 38.Double 94 =
  39. 39.Half of 90 =
  40. 40.Double 75 =

Answer key

  1. 192
  2. 29
  3. 144
  4. 75
  5. 112
  6. 31
  7. 62
  8. 162
  9. 186
  10. 122
  11. 82
  12. 52
  13. 32
  14. 130
  15. 92
  16. 24
  17. 77
  18. 182
  19. 83
  20. 36
  21. 116
  22. 50
  23. 48
  24. 30
  25. 63
  26. 66
  27. 33
  28. 78
  29. 41
  30. 79
  31. 20
  32. 25
  33. 72
  34. 55
  35. 58
  36. 136
  37. 46
  38. 188
  39. 45
  40. 150

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