← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 709 · 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 70 =
  2. 2.Double 95 =
  3. 3.Half of 184 =
  4. 4.Double 33 =
  5. 5.Double 64 =
  6. 6.Half of 156 =
  7. 7.Half of 52 =
  8. 8.Double 49 =
  9. 9.Double 68 =
  10. 10.Half of 146 =
  11. 11.Half of 182 =
  12. 12.Half of 74 =
  13. 13.Half of 160 =
  14. 14.Double 84 =
  15. 15.Double 52 =
  16. 16.Double 36 =
  17. 17.Half of 102 =
  18. 18.Half of 108 =
  19. 19.Double 99 =
  20. 20.Double 25 =
  21. 21.Half of 38 =
  22. 22.Half of 86 =
  23. 23.Half of 48 =
  24. 24.Double 91 =
  25. 25.Half of 128 =
  26. 26.Half of 82 =
  27. 27.Half of 78 =
  28. 28.Double 35 =
  29. 29.Double 81 =
  30. 30.Half of 96 =
  31. 31.Double 51 =
  32. 32.Double 59 =
  33. 33.Double 72 =
  34. 34.Double 37 =
  35. 35.Half of 180 =
  36. 36.Double 16 =
  37. 37.Half of 192 =
  38. 38.Half of 164 =
  39. 39.Half of 150 =
  40. 40.Half of 50 =

Answer key

  1. 35
  2. 190
  3. 92
  4. 66
  5. 128
  6. 78
  7. 26
  8. 98
  9. 136
  10. 73
  11. 91
  12. 37
  13. 80
  14. 168
  15. 104
  16. 72
  17. 51
  18. 54
  19. 198
  20. 50
  21. 19
  22. 43
  23. 24
  24. 182
  25. 64
  26. 41
  27. 39
  28. 70
  29. 162
  30. 48
  31. 102
  32. 118
  33. 144
  34. 74
  35. 90
  36. 32
  37. 96
  38. 82
  39. 75
  40. 25

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