← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 151 · 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 184 =
  2. 2.Half of 52 =
  3. 3.Double 66 =
  4. 4.Double 54 =
  5. 5.Half of 134 =
  6. 6.Double 27 =
  7. 7.Double 52 =
  8. 8.Double 69 =
  9. 9.Half of 160 =
  10. 10.Double 19 =
  11. 11.Double 32 =
  12. 12.Double 49 =
  13. 13.Half of 132 =
  14. 14.Double 51 =
  15. 15.Double 28 =
  16. 16.Double 21 =
  17. 17.Half of 166 =
  18. 18.Half of 60 =
  19. 19.Half of 178 =
  20. 20.Half of 76 =
  21. 21.Double 82 =
  22. 22.Half of 162 =
  23. 23.Double 25 =
  24. 24.Half of 104 =
  25. 25.Half of 40 =
  26. 26.Half of 38 =
  27. 27.Half of 68 =
  28. 28.Half of 70 =
  29. 29.Half of 64 =
  30. 30.Half of 46 =
  31. 31.Double 75 =
  32. 32.Half of 192 =
  33. 33.Double 16 =
  34. 34.Half of 72 =
  35. 35.Half of 158 =
  36. 36.Half of 142 =
  37. 37.Double 81 =
  38. 38.Half of 176 =
  39. 39.Double 41 =
  40. 40.Half of 138 =

Answer key

  1. 92
  2. 26
  3. 132
  4. 108
  5. 67
  6. 54
  7. 104
  8. 138
  9. 80
  10. 38
  11. 64
  12. 98
  13. 66
  14. 102
  15. 56
  16. 42
  17. 83
  18. 30
  19. 89
  20. 38
  21. 164
  22. 81
  23. 50
  24. 52
  25. 20
  26. 19
  27. 34
  28. 35
  29. 32
  30. 23
  31. 150
  32. 96
  33. 32
  34. 36
  35. 79
  36. 71
  37. 162
  38. 88
  39. 82
  40. 69

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