← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 217 · 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 71 =
  2. 2.Half of 118 =
  3. 3.Double 87 =
  4. 4.Double 31 =
  5. 5.Double 27 =
  6. 6.Half of 170 =
  7. 7.Double 23 =
  8. 8.Half of 40 =
  9. 9.Half of 184 =
  10. 10.Half of 90 =
  11. 11.Double 41 =
  12. 12.Half of 126 =
  13. 13.Double 47 =
  14. 14.Double 64 =
  15. 15.Double 57 =
  16. 16.Half of 64 =
  17. 17.Half of 58 =
  18. 18.Double 36 =
  19. 19.Double 81 =
  20. 20.Double 85 =
  21. 21.Half of 180 =
  22. 22.Double 89 =
  23. 23.Double 51 =
  24. 24.Double 69 =
  25. 25.Double 21 =
  26. 26.Half of 82 =
  27. 27.Half of 54 =
  28. 28.Double 24 =
  29. 29.Half of 92 =
  30. 30.Half of 76 =
  31. 31.Double 62 =
  32. 32.Half of 144 =
  33. 33.Half of 160 =
  34. 34.Half of 98 =
  35. 35.Half of 108 =
  36. 36.Half of 36 =
  37. 37.Half of 198 =
  38. 38.Double 39 =
  39. 39.Double 45 =
  40. 40.Half of 164 =

Answer key

  1. 142
  2. 59
  3. 174
  4. 62
  5. 54
  6. 85
  7. 46
  8. 20
  9. 92
  10. 45
  11. 82
  12. 63
  13. 94
  14. 128
  15. 114
  16. 32
  17. 29
  18. 72
  19. 162
  20. 170
  21. 90
  22. 178
  23. 102
  24. 138
  25. 42
  26. 41
  27. 27
  28. 48
  29. 46
  30. 38
  31. 124
  32. 72
  33. 80
  34. 49
  35. 54
  36. 18
  37. 99
  38. 78
  39. 90
  40. 82

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