← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 196 · 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 61 =
  2. 2.Double 64 =
  3. 3.Half of 172 =
  4. 4.Half of 42 =
  5. 5.Double 88 =
  6. 6.Double 46 =
  7. 7.Double 76 =
  8. 8.Double 29 =
  9. 9.Half of 70 =
  10. 10.Half of 50 =
  11. 11.Half of 80 =
  12. 12.Half of 196 =
  13. 13.Double 21 =
  14. 14.Double 39 =
  15. 15.Half of 62 =
  16. 16.Double 22 =
  17. 17.Double 34 =
  18. 18.Half of 114 =
  19. 19.Double 25 =
  20. 20.Double 75 =
  21. 21.Half of 106 =
  22. 22.Double 51 =
  23. 23.Double 33 =
  24. 24.Half of 176 =
  25. 25.Half of 116 =
  26. 26.Half of 140 =
  27. 27.Double 67 =
  28. 28.Double 71 =
  29. 29.Half of 122 =
  30. 30.Half of 174 =
  31. 31.Half of 84 =
  32. 32.Half of 88 =
  33. 33.Double 81 =
  34. 34.Half of 198 =
  35. 35.Double 37 =
  36. 36.Double 54 =
  37. 37.Half of 182 =
  38. 38.Double 91 =
  39. 39.Double 53 =
  40. 40.Half of 154 =

Answer key

  1. 122
  2. 128
  3. 86
  4. 21
  5. 176
  6. 92
  7. 152
  8. 58
  9. 35
  10. 25
  11. 40
  12. 98
  13. 42
  14. 78
  15. 31
  16. 44
  17. 68
  18. 57
  19. 50
  20. 150
  21. 53
  22. 102
  23. 66
  24. 88
  25. 58
  26. 70
  27. 134
  28. 142
  29. 61
  30. 87
  31. 42
  32. 44
  33. 162
  34. 99
  35. 74
  36. 108
  37. 91
  38. 182
  39. 106
  40. 77

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