← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 13 · 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 98 =
  2. 2.Half of 148 =
  3. 3.Half of 36 =
  4. 4.Double 37 =
  5. 5.Double 56 =
  6. 6.Double 18 =
  7. 7.Half of 88 =
  8. 8.Half of 70 =
  9. 9.Double 44 =
  10. 10.Half of 126 =
  11. 11.Double 34 =
  12. 12.Half of 168 =
  13. 13.Double 73 =
  14. 14.Double 16 =
  15. 15.Double 91 =
  16. 16.Double 41 =
  17. 17.Double 89 =
  18. 18.Half of 142 =
  19. 19.Half of 156 =
  20. 20.Half of 60 =
  21. 21.Half of 194 =
  22. 22.Half of 134 =
  23. 23.Half of 50 =
  24. 24.Double 45 =
  25. 25.Half of 48 =
  26. 26.Half of 106 =
  27. 27.Double 28 =
  28. 28.Double 83 =
  29. 29.Double 58 =
  30. 30.Half of 34 =
  31. 31.Half of 54 =
  32. 32.Double 78 =
  33. 33.Double 29 =
  34. 34.Half of 118 =
  35. 35.Half of 62 =
  36. 36.Half of 162 =
  37. 37.Double 81 =
  38. 38.Double 57 =
  39. 39.Double 22 =
  40. 40.Double 43 =

Answer key

  1. 196
  2. 74
  3. 18
  4. 74
  5. 112
  6. 36
  7. 44
  8. 35
  9. 88
  10. 63
  11. 68
  12. 84
  13. 146
  14. 32
  15. 182
  16. 82
  17. 178
  18. 71
  19. 78
  20. 30
  21. 97
  22. 67
  23. 25
  24. 90
  25. 24
  26. 53
  27. 56
  28. 166
  29. 116
  30. 17
  31. 27
  32. 156
  33. 58
  34. 59
  35. 31
  36. 81
  37. 162
  38. 114
  39. 44
  40. 86

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