← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 904 · 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 72 =
  2. 2.Half of 48 =
  3. 3.Half of 152 =
  4. 4.Half of 54 =
  5. 5.Double 37 =
  6. 6.Double 58 =
  7. 7.Double 52 =
  8. 8.Half of 86 =
  9. 9.Double 42 =
  10. 10.Double 67 =
  11. 11.Double 83 =
  12. 12.Half of 118 =
  13. 13.Half of 82 =
  14. 14.Half of 148 =
  15. 15.Half of 58 =
  16. 16.Double 29 =
  17. 17.Half of 136 =
  18. 18.Double 38 =
  19. 19.Double 27 =
  20. 20.Double 41 =
  21. 21.Double 73 =
  22. 22.Half of 194 =
  23. 23.Half of 64 =
  24. 24.Half of 60 =
  25. 25.Half of 126 =
  26. 26.Half of 122 =
  27. 27.Double 25 =
  28. 28.Double 49 =
  29. 29.Double 74 =
  30. 30.Half of 44 =
  31. 31.Double 21 =
  32. 32.Half of 84 =
  33. 33.Half of 68 =
  34. 34.Double 88 =
  35. 35.Half of 150 =
  36. 36.Double 22 =
  37. 37.Half of 108 =
  38. 38.Half of 110 =
  39. 39.Half of 28 =
  40. 40.Double 24 =

Answer key

  1. 36
  2. 24
  3. 76
  4. 27
  5. 74
  6. 116
  7. 104
  8. 43
  9. 84
  10. 134
  11. 166
  12. 59
  13. 41
  14. 74
  15. 29
  16. 58
  17. 68
  18. 76
  19. 54
  20. 82
  21. 146
  22. 97
  23. 32
  24. 30
  25. 63
  26. 61
  27. 50
  28. 98
  29. 148
  30. 22
  31. 42
  32. 42
  33. 34
  34. 176
  35. 75
  36. 44
  37. 54
  38. 55
  39. 14
  40. 48

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