← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 670 · 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 52 =
  2. 2.Half of 100 =
  3. 3.Double 91 =
  4. 4.Half of 108 =
  5. 5.Half of 54 =
  6. 6.Double 56 =
  7. 7.Double 65 =
  8. 8.Half of 106 =
  9. 9.Double 69 =
  10. 10.Half of 184 =
  11. 11.Double 32 =
  12. 12.Double 58 =
  13. 13.Double 67 =
  14. 14.Half of 134 =
  15. 15.Double 54 =
  16. 16.Double 49 =
  17. 17.Double 68 =
  18. 18.Double 57 =
  19. 19.Double 62 =
  20. 20.Half of 26 =
  21. 21.Double 93 =
  22. 22.Double 42 =
  23. 23.Double 99 =
  24. 24.Half of 146 =
  25. 25.Double 83 =
  26. 26.Double 19 =
  27. 27.Half of 114 =
  28. 28.Double 55 =
  29. 29.Half of 36 =
  30. 30.Half of 120 =
  31. 31.Double 35 =
  32. 32.Double 85 =
  33. 33.Double 24 =
  34. 34.Double 96 =
  35. 35.Half of 182 =
  36. 36.Half of 38 =
  37. 37.Double 75 =
  38. 38.Half of 74 =
  39. 39.Half of 136 =
  40. 40.Double 94 =

Answer key

  1. 26
  2. 50
  3. 182
  4. 54
  5. 27
  6. 112
  7. 130
  8. 53
  9. 138
  10. 92
  11. 64
  12. 116
  13. 134
  14. 67
  15. 108
  16. 98
  17. 136
  18. 114
  19. 124
  20. 13
  21. 186
  22. 84
  23. 198
  24. 73
  25. 166
  26. 38
  27. 57
  28. 110
  29. 18
  30. 60
  31. 70
  32. 170
  33. 48
  34. 192
  35. 91
  36. 19
  37. 150
  38. 37
  39. 68
  40. 188

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