← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 574 · 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 95 =
  2. 2.Half of 96 =
  3. 3.Half of 138 =
  4. 4.Double 81 =
  5. 5.Double 73 =
  6. 6.Half of 132 =
  7. 7.Half of 120 =
  8. 8.Double 99 =
  9. 9.Double 22 =
  10. 10.Half of 26 =
  11. 11.Half of 32 =
  12. 12.Half of 146 =
  13. 13.Double 21 =
  14. 14.Half of 70 =
  15. 15.Double 89 =
  16. 16.Double 71 =
  17. 17.Double 82 =
  18. 18.Half of 186 =
  19. 19.Half of 174 =
  20. 20.Double 24 =
  21. 21.Half of 88 =
  22. 22.Double 31 =
  23. 23.Double 67 =
  24. 24.Double 98 =
  25. 25.Double 23 =
  26. 26.Double 91 =
  27. 27.Double 93 =
  28. 28.Half of 50 =
  29. 29.Half of 106 =
  30. 30.Double 32 =
  31. 31.Half of 30 =
  32. 32.Double 79 =
  33. 33.Half of 130 =
  34. 34.Double 62 =
  35. 35.Half of 134 =
  36. 36.Half of 158 =
  37. 37.Double 38 =
  38. 38.Half of 164 =
  39. 39.Half of 192 =
  40. 40.Half of 60 =

Answer key

  1. 190
  2. 48
  3. 69
  4. 162
  5. 146
  6. 66
  7. 60
  8. 198
  9. 44
  10. 13
  11. 16
  12. 73
  13. 42
  14. 35
  15. 178
  16. 142
  17. 164
  18. 93
  19. 87
  20. 48
  21. 44
  22. 62
  23. 134
  24. 196
  25. 46
  26. 182
  27. 186
  28. 25
  29. 53
  30. 64
  31. 15
  32. 158
  33. 65
  34. 124
  35. 67
  36. 79
  37. 76
  38. 82
  39. 96
  40. 30

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