← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 945 · 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 66 =
  2. 2.Double 28 =
  3. 3.Half of 82 =
  4. 4.Double 78 =
  5. 5.Double 95 =
  6. 6.Half of 44 =
  7. 7.Half of 168 =
  8. 8.Half of 190 =
  9. 9.Double 16 =
  10. 10.Half of 28 =
  11. 11.Half of 100 =
  12. 12.Half of 186 =
  13. 13.Half of 38 =
  14. 14.Half of 94 =
  15. 15.Half of 54 =
  16. 16.Double 19 =
  17. 17.Double 31 =
  18. 18.Double 57 =
  19. 19.Half of 174 =
  20. 20.Half of 68 =
  21. 21.Double 67 =
  22. 22.Double 22 =
  23. 23.Double 59 =
  24. 24.Double 41 =
  25. 25.Half of 144 =
  26. 26.Double 81 =
  27. 27.Double 56 =
  28. 28.Half of 120 =
  29. 29.Double 91 =
  30. 30.Half of 176 =
  31. 31.Double 39 =
  32. 32.Double 86 =
  33. 33.Double 53 =
  34. 34.Half of 116 =
  35. 35.Half of 52 =
  36. 36.Half of 58 =
  37. 37.Half of 180 =
  38. 38.Double 82 =
  39. 39.Half of 40 =
  40. 40.Half of 172 =

Answer key

  1. 33
  2. 56
  3. 41
  4. 156
  5. 190
  6. 22
  7. 84
  8. 95
  9. 32
  10. 14
  11. 50
  12. 93
  13. 19
  14. 47
  15. 27
  16. 38
  17. 62
  18. 114
  19. 87
  20. 34
  21. 134
  22. 44
  23. 118
  24. 82
  25. 72
  26. 162
  27. 112
  28. 60
  29. 182
  30. 88
  31. 78
  32. 172
  33. 106
  34. 58
  35. 26
  36. 29
  37. 90
  38. 164
  39. 20
  40. 86

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