← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 218 · 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 56 =
  2. 2.Half of 50 =
  3. 3.Double 85 =
  4. 4.Half of 80 =
  5. 5.Double 83 =
  6. 6.Half of 184 =
  7. 7.Double 16 =
  8. 8.Half of 142 =
  9. 9.Double 43 =
  10. 10.Double 89 =
  11. 11.Half of 84 =
  12. 12.Half of 108 =
  13. 13.Half of 170 =
  14. 14.Half of 140 =
  15. 15.Double 53 =
  16. 16.Half of 32 =
  17. 17.Double 18 =
  18. 18.Double 52 =
  19. 19.Double 86 =
  20. 20.Double 34 =
  21. 21.Double 29 =
  22. 22.Half of 96 =
  23. 23.Half of 62 =
  24. 24.Half of 94 =
  25. 25.Half of 48 =
  26. 26.Double 39 =
  27. 27.Half of 88 =
  28. 28.Half of 152 =
  29. 29.Half of 106 =
  30. 30.Half of 138 =
  31. 31.Double 92 =
  32. 32.Double 22 =
  33. 33.Half of 154 =
  34. 34.Half of 58 =
  35. 35.Half of 146 =
  36. 36.Half of 40 =
  37. 37.Double 41 =
  38. 38.Double 71 =
  39. 39.Double 95 =
  40. 40.Half of 194 =

Answer key

  1. 112
  2. 25
  3. 170
  4. 40
  5. 166
  6. 92
  7. 32
  8. 71
  9. 86
  10. 178
  11. 42
  12. 54
  13. 85
  14. 70
  15. 106
  16. 16
  17. 36
  18. 104
  19. 172
  20. 68
  21. 58
  22. 48
  23. 31
  24. 47
  25. 24
  26. 78
  27. 44
  28. 76
  29. 53
  30. 69
  31. 184
  32. 44
  33. 77
  34. 29
  35. 73
  36. 20
  37. 82
  38. 142
  39. 190
  40. 97

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