← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 39 · 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 91 =
  2. 2.Double 18 =
  3. 3.Double 66 =
  4. 4.Double 21 =
  5. 5.Double 43 =
  6. 6.Half of 56 =
  7. 7.Double 41 =
  8. 8.Half of 194 =
  9. 9.Half of 82 =
  10. 10.Double 26 =
  11. 11.Double 88 =
  12. 12.Half of 30 =
  13. 13.Double 99 =
  14. 14.Double 76 =
  15. 15.Double 85 =
  16. 16.Half of 186 =
  17. 17.Double 16 =
  18. 18.Half of 190 =
  19. 19.Half of 152 =
  20. 20.Half of 120 =
  21. 21.Half of 174 =
  22. 22.Half of 154 =
  23. 23.Half of 158 =
  24. 24.Half of 74 =
  25. 25.Half of 160 =
  26. 26.Double 38 =
  27. 27.Double 58 =
  28. 28.Half of 148 =
  29. 29.Double 61 =
  30. 30.Half of 54 =
  31. 31.Double 28 =
  32. 32.Double 57 =
  33. 33.Half of 72 =
  34. 34.Double 54 =
  35. 35.Half of 146 =
  36. 36.Half of 192 =
  37. 37.Half of 42 =
  38. 38.Double 17 =
  39. 39.Half of 172 =
  40. 40.Half of 64 =

Answer key

  1. 182
  2. 36
  3. 132
  4. 42
  5. 86
  6. 28
  7. 82
  8. 97
  9. 41
  10. 52
  11. 176
  12. 15
  13. 198
  14. 152
  15. 170
  16. 93
  17. 32
  18. 95
  19. 76
  20. 60
  21. 87
  22. 77
  23. 79
  24. 37
  25. 80
  26. 76
  27. 116
  28. 74
  29. 122
  30. 27
  31. 56
  32. 114
  33. 36
  34. 108
  35. 73
  36. 96
  37. 21
  38. 34
  39. 86
  40. 32

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