← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 5 · 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 61 =
  2. 2.Double 41 =
  3. 3.Double 22 =
  4. 4.Half of 176 =
  5. 5.Half of 26 =
  6. 6.Double 19 =
  7. 7.Double 35 =
  8. 8.Half of 136 =
  9. 9.Double 52 =
  10. 10.Double 55 =
  11. 11.Double 31 =
  12. 12.Half of 178 =
  13. 13.Double 89 =
  14. 14.Double 71 =
  15. 15.Half of 72 =
  16. 16.Double 48 =
  17. 17.Double 26 =
  18. 18.Half of 190 =
  19. 19.Half of 114 =
  20. 20.Half of 166 =
  21. 21.Double 81 =
  22. 22.Double 86 =
  23. 23.Half of 138 =
  24. 24.Double 83 =
  25. 25.Half of 36 =
  26. 26.Half of 38 =
  27. 27.Double 57 =
  28. 28.Double 77 =
  29. 29.Half of 56 =
  30. 30.Double 21 =
  31. 31.Half of 128 =
  32. 32.Double 23 =
  33. 33.Double 91 =
  34. 34.Double 27 =
  35. 35.Half of 172 =
  36. 36.Double 73 =
  37. 37.Double 64 =
  38. 38.Half of 66 =
  39. 39.Double 76 =
  40. 40.Double 84 =

Answer key

  1. 122
  2. 82
  3. 44
  4. 88
  5. 13
  6. 38
  7. 70
  8. 68
  9. 104
  10. 110
  11. 62
  12. 89
  13. 178
  14. 142
  15. 36
  16. 96
  17. 52
  18. 95
  19. 57
  20. 83
  21. 162
  22. 172
  23. 69
  24. 166
  25. 18
  26. 19
  27. 114
  28. 154
  29. 28
  30. 42
  31. 64
  32. 46
  33. 182
  34. 54
  35. 86
  36. 146
  37. 128
  38. 33
  39. 152
  40. 168

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