← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 306 · 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 168 =
  2. 2.Double 81 =
  3. 3.Half of 62 =
  4. 4.Half of 126 =
  5. 5.Double 25 =
  6. 6.Double 85 =
  7. 7.Double 45 =
  8. 8.Half of 184 =
  9. 9.Half of 190 =
  10. 10.Double 91 =
  11. 11.Double 99 =
  12. 12.Double 51 =
  13. 13.Half of 74 =
  14. 14.Half of 56 =
  15. 15.Double 23 =
  16. 16.Double 74 =
  17. 17.Half of 112 =
  18. 18.Double 88 =
  19. 19.Half of 78 =
  20. 20.Double 71 =
  21. 21.Half of 158 =
  22. 22.Half of 42 =
  23. 23.Double 97 =
  24. 24.Half of 118 =
  25. 25.Double 46 =
  26. 26.Double 36 =
  27. 27.Half of 32 =
  28. 28.Double 34 =
  29. 29.Half of 186 =
  30. 30.Double 24 =
  31. 31.Half of 38 =
  32. 32.Half of 182 =
  33. 33.Double 73 =
  34. 34.Half of 68 =
  35. 35.Double 79 =
  36. 36.Half of 88 =
  37. 37.Half of 120 =
  38. 38.Double 93 =
  39. 39.Half of 48 =
  40. 40.Double 75 =

Answer key

  1. 84
  2. 162
  3. 31
  4. 63
  5. 50
  6. 170
  7. 90
  8. 92
  9. 95
  10. 182
  11. 198
  12. 102
  13. 37
  14. 28
  15. 46
  16. 148
  17. 56
  18. 176
  19. 39
  20. 142
  21. 79
  22. 21
  23. 194
  24. 59
  25. 92
  26. 72
  27. 16
  28. 68
  29. 93
  30. 48
  31. 19
  32. 91
  33. 146
  34. 34
  35. 158
  36. 44
  37. 60
  38. 186
  39. 24
  40. 150

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