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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 873 · 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 152 =
  2. 2.Double 31 =
  3. 3.Double 69 =
  4. 4.Double 81 =
  5. 5.Double 74 =
  6. 6.Half of 64 =
  7. 7.Half of 96 =
  8. 8.Double 49 =
  9. 9.Double 95 =
  10. 10.Half of 150 =
  11. 11.Half of 160 =
  12. 12.Half of 78 =
  13. 13.Half of 66 =
  14. 14.Double 53 =
  15. 15.Double 32 =
  16. 16.Half of 38 =
  17. 17.Double 16 =
  18. 18.Half of 90 =
  19. 19.Half of 58 =
  20. 20.Double 68 =
  21. 21.Double 66 =
  22. 22.Double 47 =
  23. 23.Double 44 =
  24. 24.Double 93 =
  25. 25.Half of 34 =
  26. 26.Double 86 =
  27. 27.Half of 166 =
  28. 28.Double 54 =
  29. 29.Double 36 =
  30. 30.Double 23 =
  31. 31.Double 37 =
  32. 32.Double 58 =
  33. 33.Half of 142 =
  34. 34.Half of 60 =
  35. 35.Half of 128 =
  36. 36.Double 62 =
  37. 37.Double 75 =
  38. 38.Half of 130 =
  39. 39.Double 55 =
  40. 40.Double 22 =

Answer key

  1. 76
  2. 62
  3. 138
  4. 162
  5. 148
  6. 32
  7. 48
  8. 98
  9. 190
  10. 75
  11. 80
  12. 39
  13. 33
  14. 106
  15. 64
  16. 19
  17. 32
  18. 45
  19. 29
  20. 136
  21. 132
  22. 94
  23. 88
  24. 186
  25. 17
  26. 172
  27. 83
  28. 108
  29. 72
  30. 46
  31. 74
  32. 116
  33. 71
  34. 30
  35. 64
  36. 124
  37. 150
  38. 65
  39. 110
  40. 44

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