← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 199 · 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.Half of 172 =
  3. 3.Double 54 =
  4. 4.Half of 170 =
  5. 5.Half of 44 =
  6. 6.Double 27 =
  7. 7.Double 69 =
  8. 8.Double 61 =
  9. 9.Double 82 =
  10. 10.Double 37 =
  11. 11.Double 21 =
  12. 12.Double 29 =
  13. 13.Half of 48 =
  14. 14.Double 85 =
  15. 15.Half of 190 =
  16. 16.Double 94 =
  17. 17.Double 47 =
  18. 18.Double 58 =
  19. 19.Half of 118 =
  20. 20.Half of 192 =
  21. 21.Half of 122 =
  22. 22.Double 49 =
  23. 23.Half of 106 =
  24. 24.Double 96 =
  25. 25.Double 55 =
  26. 26.Half of 30 =
  27. 27.Half of 34 =
  28. 28.Half of 64 =
  29. 29.Double 22 =
  30. 30.Half of 58 =
  31. 31.Half of 174 =
  32. 32.Double 76 =
  33. 33.Double 84 =
  34. 34.Half of 142 =
  35. 35.Half of 52 =
  36. 36.Double 86 =
  37. 37.Double 77 =
  38. 38.Double 33 =
  39. 39.Half of 40 =
  40. 40.Half of 86 =

Answer key

  1. 182
  2. 86
  3. 108
  4. 85
  5. 22
  6. 54
  7. 138
  8. 122
  9. 164
  10. 74
  11. 42
  12. 58
  13. 24
  14. 170
  15. 95
  16. 188
  17. 94
  18. 116
  19. 59
  20. 96
  21. 61
  22. 98
  23. 53
  24. 192
  25. 110
  26. 15
  27. 17
  28. 32
  29. 44
  30. 29
  31. 87
  32. 152
  33. 168
  34. 71
  35. 26
  36. 172
  37. 154
  38. 66
  39. 20
  40. 43

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