← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 452 · 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 82 =
  2. 2.Double 81 =
  3. 3.Double 51 =
  4. 4.Half of 146 =
  5. 5.Half of 166 =
  6. 6.Half of 52 =
  7. 7.Half of 28 =
  8. 8.Half of 196 =
  9. 9.Half of 142 =
  10. 10.Half of 34 =
  11. 11.Half of 80 =
  12. 12.Double 25 =
  13. 13.Half of 78 =
  14. 14.Half of 66 =
  15. 15.Half of 42 =
  16. 16.Half of 104 =
  17. 17.Double 53 =
  18. 18.Double 79 =
  19. 19.Half of 172 =
  20. 20.Double 78 =
  21. 21.Double 38 =
  22. 22.Half of 90 =
  23. 23.Half of 96 =
  24. 24.Half of 48 =
  25. 25.Half of 70 =
  26. 26.Double 96 =
  27. 27.Half of 140 =
  28. 28.Half of 182 =
  29. 29.Half of 32 =
  30. 30.Half of 50 =
  31. 31.Double 41 =
  32. 32.Half of 106 =
  33. 33.Double 95 =
  34. 34.Double 26 =
  35. 35.Half of 154 =
  36. 36.Half of 128 =
  37. 37.Double 24 =
  38. 38.Double 28 =
  39. 39.Double 18 =
  40. 40.Double 34 =

Answer key

  1. 164
  2. 162
  3. 102
  4. 73
  5. 83
  6. 26
  7. 14
  8. 98
  9. 71
  10. 17
  11. 40
  12. 50
  13. 39
  14. 33
  15. 21
  16. 52
  17. 106
  18. 158
  19. 86
  20. 156
  21. 76
  22. 45
  23. 48
  24. 24
  25. 35
  26. 192
  27. 70
  28. 91
  29. 16
  30. 25
  31. 82
  32. 53
  33. 190
  34. 52
  35. 77
  36. 64
  37. 48
  38. 56
  39. 36
  40. 68

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