← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 544 · 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 166 =
  2. 2.Double 51 =
  3. 3.Double 74 =
  4. 4.Double 42 =
  5. 5.Double 26 =
  6. 6.Half of 86 =
  7. 7.Double 73 =
  8. 8.Double 17 =
  9. 9.Double 39 =
  10. 10.Half of 146 =
  11. 11.Double 88 =
  12. 12.Double 53 =
  13. 13.Double 22 =
  14. 14.Double 83 =
  15. 15.Double 77 =
  16. 16.Half of 188 =
  17. 17.Half of 46 =
  18. 18.Half of 36 =
  19. 19.Half of 82 =
  20. 20.Double 58 =
  21. 21.Double 31 =
  22. 22.Double 21 =
  23. 23.Half of 114 =
  24. 24.Double 91 =
  25. 25.Half of 112 =
  26. 26.Half of 84 =
  27. 27.Double 75 =
  28. 28.Double 62 =
  29. 29.Double 23 =
  30. 30.Half of 50 =
  31. 31.Double 68 =
  32. 32.Half of 172 =
  33. 33.Half of 26 =
  34. 34.Half of 74 =
  35. 35.Double 37 =
  36. 36.Double 49 =
  37. 37.Double 71 =
  38. 38.Double 86 =
  39. 39.Half of 162 =
  40. 40.Double 87 =

Answer key

  1. 83
  2. 102
  3. 148
  4. 84
  5. 52
  6. 43
  7. 146
  8. 34
  9. 78
  10. 73
  11. 176
  12. 106
  13. 44
  14. 166
  15. 154
  16. 94
  17. 23
  18. 18
  19. 41
  20. 116
  21. 62
  22. 42
  23. 57
  24. 182
  25. 56
  26. 42
  27. 150
  28. 124
  29. 46
  30. 25
  31. 136
  32. 86
  33. 13
  34. 37
  35. 74
  36. 98
  37. 142
  38. 172
  39. 81
  40. 174

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