← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 508 · 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 34 =
  2. 2.Double 76 =
  3. 3.Double 19 =
  4. 4.Double 55 =
  5. 5.Half of 146 =
  6. 6.Half of 152 =
  7. 7.Half of 80 =
  8. 8.Double 94 =
  9. 9.Double 85 =
  10. 10.Double 59 =
  11. 11.Half of 188 =
  12. 12.Half of 44 =
  13. 13.Double 83 =
  14. 14.Double 37 =
  15. 15.Half of 72 =
  16. 16.Half of 132 =
  17. 17.Half of 88 =
  18. 18.Double 75 =
  19. 19.Double 44 =
  20. 20.Double 73 =
  21. 21.Half of 48 =
  22. 22.Double 67 =
  23. 23.Double 58 =
  24. 24.Half of 34 =
  25. 25.Half of 136 =
  26. 26.Half of 28 =
  27. 27.Double 89 =
  28. 28.Double 61 =
  29. 29.Double 27 =
  30. 30.Double 68 =
  31. 31.Double 38 =
  32. 32.Half of 182 =
  33. 33.Half of 142 =
  34. 34.Half of 106 =
  35. 35.Half of 52 =
  36. 36.Double 51 =
  37. 37.Half of 108 =
  38. 38.Double 43 =
  39. 39.Half of 26 =
  40. 40.Half of 40 =

Answer key

  1. 68
  2. 152
  3. 38
  4. 110
  5. 73
  6. 76
  7. 40
  8. 188
  9. 170
  10. 118
  11. 94
  12. 22
  13. 166
  14. 74
  15. 36
  16. 66
  17. 44
  18. 150
  19. 88
  20. 146
  21. 24
  22. 134
  23. 116
  24. 17
  25. 68
  26. 14
  27. 178
  28. 122
  29. 54
  30. 136
  31. 76
  32. 91
  33. 71
  34. 53
  35. 26
  36. 102
  37. 54
  38. 86
  39. 13
  40. 20

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