← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 736 · 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 166 =
  2. 2.Double 95 =
  3. 3.Double 27 =
  4. 4.Half of 130 =
  5. 5.Half of 82 =
  6. 6.Half of 180 =
  7. 7.Double 44 =
  8. 8.Double 62 =
  9. 9.Double 18 =
  10. 10.Double 83 =
  11. 11.Double 87 =
  12. 12.Double 39 =
  13. 13.Double 52 =
  14. 14.Double 51 =
  15. 15.Double 22 =
  16. 16.Double 31 =
  17. 17.Double 26 =
  18. 18.Double 41 =
  19. 19.Half of 94 =
  20. 20.Half of 136 =
  21. 21.Double 29 =
  22. 22.Half of 42 =
  23. 23.Double 99 =
  24. 24.Half of 176 =
  25. 25.Half of 34 =
  26. 26.Half of 90 =
  27. 27.Double 48 =
  28. 28.Half of 102 =
  29. 29.Double 49 =
  30. 30.Half of 64 =
  31. 31.Half of 168 =
  32. 32.Half of 84 =
  33. 33.Half of 38 =
  34. 34.Double 71 =
  35. 35.Half of 112 =
  36. 36.Half of 114 =
  37. 37.Half of 158 =
  38. 38.Half of 36 =
  39. 39.Half of 28 =
  40. 40.Half of 126 =

Answer key

  1. 83
  2. 190
  3. 54
  4. 65
  5. 41
  6. 90
  7. 88
  8. 124
  9. 36
  10. 166
  11. 174
  12. 78
  13. 104
  14. 102
  15. 44
  16. 62
  17. 52
  18. 82
  19. 47
  20. 68
  21. 58
  22. 21
  23. 198
  24. 88
  25. 17
  26. 45
  27. 96
  28. 51
  29. 98
  30. 32
  31. 84
  32. 42
  33. 19
  34. 142
  35. 56
  36. 57
  37. 79
  38. 18
  39. 14
  40. 63

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