← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 181 · 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 68 =
  2. 2.Double 72 =
  3. 3.Half of 158 =
  4. 4.Double 54 =
  5. 5.Half of 106 =
  6. 6.Half of 182 =
  7. 7.Half of 156 =
  8. 8.Half of 184 =
  9. 9.Half of 66 =
  10. 10.Half of 30 =
  11. 11.Half of 60 =
  12. 12.Double 36 =
  13. 13.Double 59 =
  14. 14.Double 73 =
  15. 15.Half of 70 =
  16. 16.Half of 52 =
  17. 17.Double 32 =
  18. 18.Double 41 =
  19. 19.Half of 76 =
  20. 20.Double 94 =
  21. 21.Half of 110 =
  22. 22.Half of 96 =
  23. 23.Half of 36 =
  24. 24.Half of 160 =
  25. 25.Half of 72 =
  26. 26.Double 99 =
  27. 27.Double 43 =
  28. 28.Double 61 =
  29. 29.Double 78 =
  30. 30.Double 53 =
  31. 31.Double 86 =
  32. 32.Half of 84 =
  33. 33.Double 38 =
  34. 34.Half of 144 =
  35. 35.Double 18 =
  36. 36.Double 71 =
  37. 37.Double 55 =
  38. 38.Double 51 =
  39. 39.Double 89 =
  40. 40.Double 82 =

Answer key

  1. 136
  2. 144
  3. 79
  4. 108
  5. 53
  6. 91
  7. 78
  8. 92
  9. 33
  10. 15
  11. 30
  12. 72
  13. 118
  14. 146
  15. 35
  16. 26
  17. 64
  18. 82
  19. 38
  20. 188
  21. 55
  22. 48
  23. 18
  24. 80
  25. 36
  26. 198
  27. 86
  28. 122
  29. 156
  30. 106
  31. 172
  32. 42
  33. 76
  34. 72
  35. 36
  36. 142
  37. 110
  38. 102
  39. 178
  40. 164

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