← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 731 · 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 166 =
  2. 2.Double 68 =
  3. 3.Double 71 =
  4. 4.Half of 74 =
  5. 5.Double 91 =
  6. 6.Double 21 =
  7. 7.Half of 92 =
  8. 8.Double 48 =
  9. 9.Half of 174 =
  10. 10.Double 51 =
  11. 11.Double 96 =
  12. 12.Double 69 =
  13. 13.Half of 42 =
  14. 14.Double 23 =
  15. 15.Half of 30 =
  16. 16.Half of 188 =
  17. 17.Double 45 =
  18. 18.Double 29 =
  19. 19.Double 17 =
  20. 20.Double 84 =
  21. 21.Half of 80 =
  22. 22.Double 58 =
  23. 23.Half of 28 =
  24. 24.Double 53 =
  25. 25.Double 77 =
  26. 26.Half of 106 =
  27. 27.Double 34 =
  28. 28.Double 81 =
  29. 29.Half of 144 =
  30. 30.Half of 44 =
  31. 31.Double 75 =
  32. 32.Double 38 =
  33. 33.Half of 134 =
  34. 34.Half of 38 =
  35. 35.Half of 98 =
  36. 36.Double 33 =
  37. 37.Half of 62 =
  38. 38.Half of 36 =
  39. 39.Double 74 =
  40. 40.Half of 160 =

Answer key

  1. 83
  2. 136
  3. 142
  4. 37
  5. 182
  6. 42
  7. 46
  8. 96
  9. 87
  10. 102
  11. 192
  12. 138
  13. 21
  14. 46
  15. 15
  16. 94
  17. 90
  18. 58
  19. 34
  20. 168
  21. 40
  22. 116
  23. 14
  24. 106
  25. 154
  26. 53
  27. 68
  28. 162
  29. 72
  30. 22
  31. 150
  32. 76
  33. 67
  34. 19
  35. 49
  36. 66
  37. 31
  38. 18
  39. 148
  40. 80

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