← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 682 · 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 85 =
  2. 2.Double 69 =
  3. 3.Half of 186 =
  4. 4.Half of 36 =
  5. 5.Half of 98 =
  6. 6.Double 74 =
  7. 7.Double 81 =
  8. 8.Half of 100 =
  9. 9.Half of 62 =
  10. 10.Half of 164 =
  11. 11.Half of 32 =
  12. 12.Double 46 =
  13. 13.Double 17 =
  14. 14.Double 58 =
  15. 15.Double 33 =
  16. 16.Half of 40 =
  17. 17.Half of 160 =
  18. 18.Double 68 =
  19. 19.Half of 80 =
  20. 20.Double 89 =
  21. 21.Half of 174 =
  22. 22.Half of 170 =
  23. 23.Half of 172 =
  24. 24.Double 62 =
  25. 25.Half of 130 =
  26. 26.Half of 154 =
  27. 27.Double 35 =
  28. 28.Double 32 =
  29. 29.Double 38 =
  30. 30.Double 83 =
  31. 31.Half of 34 =
  32. 32.Half of 152 =
  33. 33.Half of 82 =
  34. 34.Half of 128 =
  35. 35.Double 25 =
  36. 36.Double 27 =
  37. 37.Double 48 =
  38. 38.Half of 184 =
  39. 39.Double 78 =
  40. 40.Double 79 =

Answer key

  1. 170
  2. 138
  3. 93
  4. 18
  5. 49
  6. 148
  7. 162
  8. 50
  9. 31
  10. 82
  11. 16
  12. 92
  13. 34
  14. 116
  15. 66
  16. 20
  17. 80
  18. 136
  19. 40
  20. 178
  21. 87
  22. 85
  23. 86
  24. 124
  25. 65
  26. 77
  27. 70
  28. 64
  29. 76
  30. 166
  31. 17
  32. 76
  33. 41
  34. 64
  35. 50
  36. 54
  37. 96
  38. 92
  39. 156
  40. 158

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