← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 825 · 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 48 =
  2. 2.Double 56 =
  3. 3.Half of 84 =
  4. 4.Double 47 =
  5. 5.Half of 156 =
  6. 6.Half of 146 =
  7. 7.Double 86 =
  8. 8.Half of 26 =
  9. 9.Half of 34 =
  10. 10.Double 29 =
  11. 11.Half of 112 =
  12. 12.Half of 78 =
  13. 13.Half of 154 =
  14. 14.Double 91 =
  15. 15.Double 74 =
  16. 16.Double 77 =
  17. 17.Double 24 =
  18. 18.Double 16 =
  19. 19.Half of 194 =
  20. 20.Double 35 =
  21. 21.Double 17 =
  22. 22.Double 82 =
  23. 23.Half of 188 =
  24. 24.Half of 76 =
  25. 25.Half of 122 =
  26. 26.Half of 144 =
  27. 27.Half of 114 =
  28. 28.Half of 50 =
  29. 29.Half of 66 =
  30. 30.Double 71 =
  31. 31.Double 99 =
  32. 32.Half of 32 =
  33. 33.Double 66 =
  34. 34.Half of 178 =
  35. 35.Half of 102 =
  36. 36.Half of 120 =
  37. 37.Half of 64 =
  38. 38.Half of 160 =
  39. 39.Half of 94 =
  40. 40.Double 38 =

Answer key

  1. 24
  2. 112
  3. 42
  4. 94
  5. 78
  6. 73
  7. 172
  8. 13
  9. 17
  10. 58
  11. 56
  12. 39
  13. 77
  14. 182
  15. 148
  16. 154
  17. 48
  18. 32
  19. 97
  20. 70
  21. 34
  22. 164
  23. 94
  24. 38
  25. 61
  26. 72
  27. 57
  28. 25
  29. 33
  30. 142
  31. 198
  32. 16
  33. 132
  34. 89
  35. 51
  36. 60
  37. 32
  38. 80
  39. 47
  40. 76

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