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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 986 · 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 76 =
  2. 2.Double 31 =
  3. 3.Half of 96 =
  4. 4.Half of 92 =
  5. 5.Double 59 =
  6. 6.Double 25 =
  7. 7.Double 21 =
  8. 8.Half of 172 =
  9. 9.Half of 78 =
  10. 10.Half of 198 =
  11. 11.Double 61 =
  12. 12.Half of 28 =
  13. 13.Double 24 =
  14. 14.Double 36 =
  15. 15.Half of 26 =
  16. 16.Half of 194 =
  17. 17.Double 19 =
  18. 18.Double 38 =
  19. 19.Half of 44 =
  20. 20.Half of 38 =
  21. 21.Double 26 =
  22. 22.Half of 54 =
  23. 23.Half of 66 =
  24. 24.Half of 166 =
  25. 25.Half of 114 =
  26. 26.Double 39 =
  27. 27.Half of 188 =
  28. 28.Double 27 =
  29. 29.Double 52 =
  30. 30.Double 58 =
  31. 31.Half of 42 =
  32. 32.Double 64 =
  33. 33.Half of 130 =
  34. 34.Half of 36 =
  35. 35.Half of 128 =
  36. 36.Half of 80 =
  37. 37.Half of 60 =
  38. 38.Half of 164 =
  39. 39.Double 81 =
  40. 40.Double 49 =

Answer key

  1. 38
  2. 62
  3. 48
  4. 46
  5. 118
  6. 50
  7. 42
  8. 86
  9. 39
  10. 99
  11. 122
  12. 14
  13. 48
  14. 72
  15. 13
  16. 97
  17. 38
  18. 76
  19. 22
  20. 19
  21. 52
  22. 27
  23. 33
  24. 83
  25. 57
  26. 78
  27. 94
  28. 54
  29. 104
  30. 116
  31. 21
  32. 128
  33. 65
  34. 18
  35. 64
  36. 40
  37. 30
  38. 82
  39. 162
  40. 98

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