← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 591 · 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 21 =
  2. 2.Double 22 =
  3. 3.Half of 34 =
  4. 4.Double 42 =
  5. 5.Double 34 =
  6. 6.Double 81 =
  7. 7.Double 89 =
  8. 8.Double 51 =
  9. 9.Double 39 =
  10. 10.Half of 150 =
  11. 11.Double 26 =
  12. 12.Double 24 =
  13. 13.Half of 60 =
  14. 14.Double 43 =
  15. 15.Half of 56 =
  16. 16.Half of 54 =
  17. 17.Half of 76 =
  18. 18.Half of 106 =
  19. 19.Half of 152 =
  20. 20.Half of 140 =
  21. 21.Half of 174 =
  22. 22.Half of 182 =
  23. 23.Half of 122 =
  24. 24.Half of 32 =
  25. 25.Half of 40 =
  26. 26.Double 31 =
  27. 27.Double 28 =
  28. 28.Double 46 =
  29. 29.Double 85 =
  30. 30.Double 65 =
  31. 31.Double 19 =
  32. 32.Double 61 =
  33. 33.Half of 142 =
  34. 34.Half of 158 =
  35. 35.Half of 98 =
  36. 36.Half of 96 =
  37. 37.Double 98 =
  38. 38.Double 47 =
  39. 39.Double 66 =
  40. 40.Half of 102 =

Answer key

  1. 42
  2. 44
  3. 17
  4. 84
  5. 68
  6. 162
  7. 178
  8. 102
  9. 78
  10. 75
  11. 52
  12. 48
  13. 30
  14. 86
  15. 28
  16. 27
  17. 38
  18. 53
  19. 76
  20. 70
  21. 87
  22. 91
  23. 61
  24. 16
  25. 20
  26. 62
  27. 56
  28. 92
  29. 170
  30. 130
  31. 38
  32. 122
  33. 71
  34. 79
  35. 49
  36. 48
  37. 196
  38. 94
  39. 132
  40. 51

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