← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 40 · 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 86 =
  2. 2.Half of 190 =
  3. 3.Half of 164 =
  4. 4.Double 51 =
  5. 5.Half of 192 =
  6. 6.Double 17 =
  7. 7.Double 27 =
  8. 8.Double 93 =
  9. 9.Half of 198 =
  10. 10.Double 95 =
  11. 11.Double 35 =
  12. 12.Double 42 =
  13. 13.Double 71 =
  14. 14.Half of 148 =
  15. 15.Double 46 =
  16. 16.Half of 42 =
  17. 17.Half of 102 =
  18. 18.Double 77 =
  19. 19.Half of 28 =
  20. 20.Half of 182 =
  21. 21.Half of 180 =
  22. 22.Half of 130 =
  23. 23.Double 84 =
  24. 24.Half of 82 =
  25. 25.Double 24 =
  26. 26.Half of 150 =
  27. 27.Half of 132 =
  28. 28.Half of 146 =
  29. 29.Half of 72 =
  30. 30.Half of 88 =
  31. 31.Double 26 =
  32. 32.Half of 66 =
  33. 33.Double 96 =
  34. 34.Half of 74 =
  35. 35.Double 59 =
  36. 36.Half of 70 =
  37. 37.Half of 50 =
  38. 38.Half of 30 =
  39. 39.Double 39 =
  40. 40.Double 86 =

Answer key

  1. 43
  2. 95
  3. 82
  4. 102
  5. 96
  6. 34
  7. 54
  8. 186
  9. 99
  10. 190
  11. 70
  12. 84
  13. 142
  14. 74
  15. 92
  16. 21
  17. 51
  18. 154
  19. 14
  20. 91
  21. 90
  22. 65
  23. 168
  24. 41
  25. 48
  26. 75
  27. 66
  28. 73
  29. 36
  30. 44
  31. 52
  32. 33
  33. 192
  34. 37
  35. 118
  36. 35
  37. 25
  38. 15
  39. 78
  40. 172

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