← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 122 · 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 116 =
  2. 2.Double 68 =
  3. 3.Half of 168 =
  4. 4.Double 47 =
  5. 5.Half of 34 =
  6. 6.Half of 100 =
  7. 7.Double 78 =
  8. 8.Double 34 =
  9. 9.Double 42 =
  10. 10.Double 74 =
  11. 11.Half of 184 =
  12. 12.Double 28 =
  13. 13.Double 31 =
  14. 14.Half of 124 =
  15. 15.Double 21 =
  16. 16.Half of 188 =
  17. 17.Double 84 =
  18. 18.Double 56 =
  19. 19.Half of 92 =
  20. 20.Double 35 =
  21. 21.Double 57 =
  22. 22.Half of 142 =
  23. 23.Half of 174 =
  24. 24.Half of 114 =
  25. 25.Half of 118 =
  26. 26.Double 49 =
  27. 27.Half of 54 =
  28. 28.Double 73 =
  29. 29.Double 96 =
  30. 30.Double 86 =
  31. 31.Double 41 =
  32. 32.Double 89 =
  33. 33.Double 29 =
  34. 34.Double 77 =
  35. 35.Double 83 =
  36. 36.Half of 122 =
  37. 37.Half of 148 =
  38. 38.Half of 160 =
  39. 39.Half of 146 =
  40. 40.Half of 108 =

Answer key

  1. 58
  2. 136
  3. 84
  4. 94
  5. 17
  6. 50
  7. 156
  8. 68
  9. 84
  10. 148
  11. 92
  12. 56
  13. 62
  14. 62
  15. 42
  16. 94
  17. 168
  18. 112
  19. 46
  20. 70
  21. 114
  22. 71
  23. 87
  24. 57
  25. 59
  26. 98
  27. 27
  28. 146
  29. 192
  30. 172
  31. 82
  32. 178
  33. 58
  34. 154
  35. 166
  36. 61
  37. 74
  38. 80
  39. 73
  40. 54

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths