← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 144 · 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 32 =
  2. 2.Double 55 =
  3. 3.Double 71 =
  4. 4.Half of 130 =
  5. 5.Double 36 =
  6. 6.Double 27 =
  7. 7.Half of 180 =
  8. 8.Half of 134 =
  9. 9.Double 34 =
  10. 10.Half of 136 =
  11. 11.Double 67 =
  12. 12.Double 25 =
  13. 13.Half of 198 =
  14. 14.Half of 122 =
  15. 15.Half of 58 =
  16. 16.Half of 32 =
  17. 17.Double 91 =
  18. 18.Half of 34 =
  19. 19.Half of 82 =
  20. 20.Half of 38 =
  21. 21.Double 47 =
  22. 22.Half of 172 =
  23. 23.Double 37 =
  24. 24.Double 73 =
  25. 25.Double 78 =
  26. 26.Half of 194 =
  27. 27.Double 84 =
  28. 28.Half of 156 =
  29. 29.Half of 26 =
  30. 30.Double 22 =
  31. 31.Half of 90 =
  32. 32.Half of 98 =
  33. 33.Half of 138 =
  34. 34.Double 19 =
  35. 35.Double 49 =
  36. 36.Half of 52 =
  37. 37.Half of 102 =
  38. 38.Half of 140 =
  39. 39.Half of 30 =
  40. 40.Half of 56 =

Answer key

  1. 64
  2. 110
  3. 142
  4. 65
  5. 72
  6. 54
  7. 90
  8. 67
  9. 68
  10. 68
  11. 134
  12. 50
  13. 99
  14. 61
  15. 29
  16. 16
  17. 182
  18. 17
  19. 41
  20. 19
  21. 94
  22. 86
  23. 74
  24. 146
  25. 156
  26. 97
  27. 168
  28. 78
  29. 13
  30. 44
  31. 45
  32. 49
  33. 69
  34. 38
  35. 98
  36. 26
  37. 51
  38. 70
  39. 15
  40. 28

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