← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 6 · 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 61 =
  2. 2.Half of 66 =
  3. 3.Half of 150 =
  4. 4.Half of 122 =
  5. 5.Double 95 =
  6. 6.Double 72 =
  7. 7.Half of 144 =
  8. 8.Half of 120 =
  9. 9.Double 88 =
  10. 10.Double 23 =
  11. 11.Double 86 =
  12. 12.Half of 54 =
  13. 13.Double 37 =
  14. 14.Double 49 =
  15. 15.Half of 38 =
  16. 16.Half of 154 =
  17. 17.Half of 188 =
  18. 18.Half of 72 =
  19. 19.Half of 52 =
  20. 20.Half of 140 =
  21. 21.Double 28 =
  22. 22.Double 29 =
  23. 23.Double 27 =
  24. 24.Half of 192 =
  25. 25.Half of 142 =
  26. 26.Half of 184 =
  27. 27.Double 81 =
  28. 28.Double 31 =
  29. 29.Double 99 =
  30. 30.Double 56 =
  31. 31.Half of 108 =
  32. 32.Half of 56 =
  33. 33.Double 92 =
  34. 34.Half of 162 =
  35. 35.Half of 148 =
  36. 36.Double 43 =
  37. 37.Double 47 =
  38. 38.Double 53 =
  39. 39.Double 26 =
  40. 40.Half of 40 =

Answer key

  1. 122
  2. 33
  3. 75
  4. 61
  5. 190
  6. 144
  7. 72
  8. 60
  9. 176
  10. 46
  11. 172
  12. 27
  13. 74
  14. 98
  15. 19
  16. 77
  17. 94
  18. 36
  19. 26
  20. 70
  21. 56
  22. 58
  23. 54
  24. 96
  25. 71
  26. 92
  27. 162
  28. 62
  29. 198
  30. 112
  31. 54
  32. 28
  33. 184
  34. 81
  35. 74
  36. 86
  37. 94
  38. 106
  39. 52
  40. 20

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