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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 752 · 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 196 =
  2. 2.Double 52 =
  3. 3.Double 39 =
  4. 4.Double 82 =
  5. 5.Half of 70 =
  6. 6.Half of 104 =
  7. 7.Half of 140 =
  8. 8.Half of 78 =
  9. 9.Double 21 =
  10. 10.Half of 120 =
  11. 11.Half of 94 =
  12. 12.Double 88 =
  13. 13.Double 63 =
  14. 14.Double 42 =
  15. 15.Double 44 =
  16. 16.Double 29 =
  17. 17.Half of 198 =
  18. 18.Half of 56 =
  19. 19.Half of 180 =
  20. 20.Double 66 =
  21. 21.Half of 176 =
  22. 22.Double 54 =
  23. 23.Double 48 =
  24. 24.Half of 32 =
  25. 25.Half of 146 =
  26. 26.Half of 26 =
  27. 27.Half of 100 =
  28. 28.Half of 102 =
  29. 29.Double 91 =
  30. 30.Half of 166 =
  31. 31.Half of 158 =
  32. 32.Half of 160 =
  33. 33.Half of 156 =
  34. 34.Double 17 =
  35. 35.Double 36 =
  36. 36.Double 86 =
  37. 37.Double 77 =
  38. 38.Double 49 =
  39. 39.Half of 122 =
  40. 40.Half of 136 =

Answer key

  1. 98
  2. 104
  3. 78
  4. 164
  5. 35
  6. 52
  7. 70
  8. 39
  9. 42
  10. 60
  11. 47
  12. 176
  13. 126
  14. 84
  15. 88
  16. 58
  17. 99
  18. 28
  19. 90
  20. 132
  21. 88
  22. 108
  23. 96
  24. 16
  25. 73
  26. 13
  27. 50
  28. 51
  29. 182
  30. 83
  31. 79
  32. 80
  33. 78
  34. 34
  35. 72
  36. 172
  37. 154
  38. 98
  39. 61
  40. 68

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