← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 293 · 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 158 =
  2. 2.Half of 60 =
  3. 3.Double 21 =
  4. 4.Half of 62 =
  5. 5.Double 89 =
  6. 6.Half of 164 =
  7. 7.Half of 166 =
  8. 8.Double 77 =
  9. 9.Half of 88 =
  10. 10.Double 26 =
  11. 11.Half of 192 =
  12. 12.Half of 96 =
  13. 13.Double 16 =
  14. 14.Double 22 =
  15. 15.Double 61 =
  16. 16.Double 32 =
  17. 17.Double 69 =
  18. 18.Half of 34 =
  19. 19.Double 54 =
  20. 20.Double 85 =
  21. 21.Double 31 =
  22. 22.Half of 130 =
  23. 23.Half of 174 =
  24. 24.Double 25 =
  25. 25.Half of 136 =
  26. 26.Half of 156 =
  27. 27.Double 79 =
  28. 28.Double 96 =
  29. 29.Half of 78 =
  30. 30.Double 28 =
  31. 31.Half of 90 =
  32. 32.Double 43 =
  33. 33.Half of 118 =
  34. 34.Half of 80 =
  35. 35.Half of 186 =
  36. 36.Half of 46 =
  37. 37.Double 55 =
  38. 38.Half of 72 =
  39. 39.Double 41 =
  40. 40.Half of 38 =

Answer key

  1. 79
  2. 30
  3. 42
  4. 31
  5. 178
  6. 82
  7. 83
  8. 154
  9. 44
  10. 52
  11. 96
  12. 48
  13. 32
  14. 44
  15. 122
  16. 64
  17. 138
  18. 17
  19. 108
  20. 170
  21. 62
  22. 65
  23. 87
  24. 50
  25. 68
  26. 78
  27. 158
  28. 192
  29. 39
  30. 56
  31. 45
  32. 86
  33. 59
  34. 40
  35. 93
  36. 23
  37. 110
  38. 36
  39. 82
  40. 19

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