← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 81 · 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 58 =
  2. 2.Double 23 =
  3. 3.Double 79 =
  4. 4.Double 84 =
  5. 5.Double 81 =
  6. 6.Double 44 =
  7. 7.Half of 152 =
  8. 8.Half of 170 =
  9. 9.Double 74 =
  10. 10.Half of 50 =
  11. 11.Half of 74 =
  12. 12.Half of 34 =
  13. 13.Double 85 =
  14. 14.Double 39 =
  15. 15.Double 71 =
  16. 16.Half of 54 =
  17. 17.Half of 44 =
  18. 18.Half of 190 =
  19. 19.Half of 186 =
  20. 20.Half of 114 =
  21. 21.Double 29 =
  22. 22.Double 61 =
  23. 23.Double 32 =
  24. 24.Double 41 =
  25. 25.Double 63 =
  26. 26.Double 26 =
  27. 27.Double 24 =
  28. 28.Double 52 =
  29. 29.Half of 64 =
  30. 30.Half of 196 =
  31. 31.Double 62 =
  32. 32.Double 57 =
  33. 33.Double 66 =
  34. 34.Half of 94 =
  35. 35.Double 17 =
  36. 36.Half of 148 =
  37. 37.Half of 124 =
  38. 38.Double 91 =
  39. 39.Half of 98 =
  40. 40.Double 31 =

Answer key

  1. 29
  2. 46
  3. 158
  4. 168
  5. 162
  6. 88
  7. 76
  8. 85
  9. 148
  10. 25
  11. 37
  12. 17
  13. 170
  14. 78
  15. 142
  16. 27
  17. 22
  18. 95
  19. 93
  20. 57
  21. 58
  22. 122
  23. 64
  24. 82
  25. 126
  26. 52
  27. 48
  28. 104
  29. 32
  30. 98
  31. 124
  32. 114
  33. 132
  34. 47
  35. 34
  36. 74
  37. 62
  38. 182
  39. 49
  40. 62

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