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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 31 · 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 31 =
  2. 2.Half of 38 =
  3. 3.Half of 130 =
  4. 4.Double 41 =
  5. 5.Double 89 =
  6. 6.Half of 48 =
  7. 7.Double 55 =
  8. 8.Half of 128 =
  9. 9.Half of 188 =
  10. 10.Half of 88 =
  11. 11.Double 25 =
  12. 12.Half of 160 =
  13. 13.Double 91 =
  14. 14.Double 85 =
  15. 15.Double 27 =
  16. 16.Double 48 =
  17. 17.Double 97 =
  18. 18.Half of 102 =
  19. 19.Half of 98 =
  20. 20.Double 21 =
  21. 21.Half of 114 =
  22. 22.Double 76 =
  23. 23.Half of 166 =
  24. 24.Half of 112 =
  25. 25.Double 43 =
  26. 26.Double 68 =
  27. 27.Half of 40 =
  28. 28.Half of 152 =
  29. 29.Double 96 =
  30. 30.Half of 54 =
  31. 31.Half of 106 =
  32. 32.Double 78 =
  33. 33.Half of 140 =
  34. 34.Half of 86 =
  35. 35.Half of 118 =
  36. 36.Double 49 =
  37. 37.Half of 60 =
  38. 38.Double 35 =
  39. 39.Double 65 =
  40. 40.Half of 42 =

Answer key

  1. 62
  2. 19
  3. 65
  4. 82
  5. 178
  6. 24
  7. 110
  8. 64
  9. 94
  10. 44
  11. 50
  12. 80
  13. 182
  14. 170
  15. 54
  16. 96
  17. 194
  18. 51
  19. 49
  20. 42
  21. 57
  22. 152
  23. 83
  24. 56
  25. 86
  26. 136
  27. 20
  28. 76
  29. 192
  30. 27
  31. 53
  32. 156
  33. 70
  34. 43
  35. 59
  36. 98
  37. 30
  38. 70
  39. 130
  40. 21

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