← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 857 · 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 67 =
  2. 2.Half of 148 =
  3. 3.Double 61 =
  4. 4.Double 43 =
  5. 5.Double 71 =
  6. 6.Double 21 =
  7. 7.Half of 118 =
  8. 8.Double 53 =
  9. 9.Half of 106 =
  10. 10.Half of 158 =
  11. 11.Half of 182 =
  12. 12.Double 78 =
  13. 13.Half of 188 =
  14. 14.Half of 54 =
  15. 15.Double 38 =
  16. 16.Double 98 =
  17. 17.Half of 68 =
  18. 18.Half of 130 =
  19. 19.Double 75 =
  20. 20.Double 66 =
  21. 21.Half of 192 =
  22. 22.Half of 174 =
  23. 23.Double 34 =
  24. 24.Half of 180 =
  25. 25.Double 89 =
  26. 26.Double 69 =
  27. 27.Double 81 =
  28. 28.Half of 190 =
  29. 29.Half of 84 =
  30. 30.Half of 36 =
  31. 31.Double 68 =
  32. 32.Half of 152 =
  33. 33.Double 45 =
  34. 34.Double 57 =
  35. 35.Double 23 =
  36. 36.Double 36 =
  37. 37.Double 17 =
  38. 38.Half of 40 =
  39. 39.Double 92 =
  40. 40.Half of 102 =

Answer key

  1. 134
  2. 74
  3. 122
  4. 86
  5. 142
  6. 42
  7. 59
  8. 106
  9. 53
  10. 79
  11. 91
  12. 156
  13. 94
  14. 27
  15. 76
  16. 196
  17. 34
  18. 65
  19. 150
  20. 132
  21. 96
  22. 87
  23. 68
  24. 90
  25. 178
  26. 138
  27. 162
  28. 95
  29. 42
  30. 18
  31. 136
  32. 76
  33. 90
  34. 114
  35. 46
  36. 72
  37. 34
  38. 20
  39. 184
  40. 51

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