← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 677 · 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 172 =
  2. 2.Double 31 =
  3. 3.Double 73 =
  4. 4.Double 95 =
  5. 5.Half of 138 =
  6. 6.Half of 58 =
  7. 7.Double 53 =
  8. 8.Half of 108 =
  9. 9.Double 28 =
  10. 10.Double 54 =
  11. 11.Double 35 =
  12. 12.Double 19 =
  13. 13.Double 63 =
  14. 14.Double 41 =
  15. 15.Double 17 =
  16. 16.Double 47 =
  17. 17.Half of 182 =
  18. 18.Half of 34 =
  19. 19.Double 62 =
  20. 20.Half of 120 =
  21. 21.Half of 186 =
  22. 22.Double 83 =
  23. 23.Half of 194 =
  24. 24.Half of 156 =
  25. 25.Half of 154 =
  26. 26.Double 93 =
  27. 27.Half of 166 =
  28. 28.Half of 178 =
  29. 29.Double 61 =
  30. 30.Double 77 =
  31. 31.Half of 148 =
  32. 32.Half of 44 =
  33. 33.Double 75 =
  34. 34.Half of 122 =
  35. 35.Double 29 =
  36. 36.Half of 78 =
  37. 37.Double 71 =
  38. 38.Half of 68 =
  39. 39.Half of 134 =
  40. 40.Double 76 =

Answer key

  1. 86
  2. 62
  3. 146
  4. 190
  5. 69
  6. 29
  7. 106
  8. 54
  9. 56
  10. 108
  11. 70
  12. 38
  13. 126
  14. 82
  15. 34
  16. 94
  17. 91
  18. 17
  19. 124
  20. 60
  21. 93
  22. 166
  23. 97
  24. 78
  25. 77
  26. 186
  27. 83
  28. 89
  29. 122
  30. 154
  31. 74
  32. 22
  33. 150
  34. 61
  35. 58
  36. 39
  37. 142
  38. 34
  39. 67
  40. 152

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