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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 938 · 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 198 =
  2. 2.Half of 176 =
  3. 3.Half of 80 =
  4. 4.Half of 70 =
  5. 5.Half of 36 =
  6. 6.Double 38 =
  7. 7.Half of 78 =
  8. 8.Double 64 =
  9. 9.Double 29 =
  10. 10.Half of 42 =
  11. 11.Double 17 =
  12. 12.Double 21 =
  13. 13.Half of 62 =
  14. 14.Double 41 =
  15. 15.Double 26 =
  16. 16.Half of 28 =
  17. 17.Half of 174 =
  18. 18.Double 25 =
  19. 19.Half of 40 =
  20. 20.Half of 56 =
  21. 21.Half of 178 =
  22. 22.Half of 60 =
  23. 23.Double 47 =
  24. 24.Half of 108 =
  25. 25.Double 39 =
  26. 26.Double 85 =
  27. 27.Half of 38 =
  28. 28.Half of 102 =
  29. 29.Double 18 =
  30. 30.Double 51 =
  31. 31.Double 78 =
  32. 32.Half of 30 =
  33. 33.Half of 150 =
  34. 34.Double 91 =
  35. 35.Double 77 =
  36. 36.Half of 86 =
  37. 37.Half of 116 =
  38. 38.Double 81 =
  39. 39.Half of 96 =
  40. 40.Half of 44 =

Answer key

  1. 99
  2. 88
  3. 40
  4. 35
  5. 18
  6. 76
  7. 39
  8. 128
  9. 58
  10. 21
  11. 34
  12. 42
  13. 31
  14. 82
  15. 52
  16. 14
  17. 87
  18. 50
  19. 20
  20. 28
  21. 89
  22. 30
  23. 94
  24. 54
  25. 78
  26. 170
  27. 19
  28. 51
  29. 36
  30. 102
  31. 156
  32. 15
  33. 75
  34. 182
  35. 154
  36. 43
  37. 58
  38. 162
  39. 48
  40. 22

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