← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 784 · 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 71 =
  2. 2.Half of 98 =
  3. 3.Half of 128 =
  4. 4.Double 28 =
  5. 5.Half of 88 =
  6. 6.Double 83 =
  7. 7.Double 81 =
  8. 8.Half of 104 =
  9. 9.Double 41 =
  10. 10.Double 16 =
  11. 11.Double 67 =
  12. 12.Double 29 =
  13. 13.Half of 86 =
  14. 14.Double 25 =
  15. 15.Half of 158 =
  16. 16.Double 68 =
  17. 17.Double 99 =
  18. 18.Half of 30 =
  19. 19.Half of 150 =
  20. 20.Double 24 =
  21. 21.Double 31 =
  22. 22.Half of 144 =
  23. 23.Double 46 =
  24. 24.Double 61 =
  25. 25.Half of 84 =
  26. 26.Half of 106 =
  27. 27.Half of 58 =
  28. 28.Half of 96 =
  29. 29.Double 65 =
  30. 30.Half of 54 =
  31. 31.Half of 34 =
  32. 32.Double 75 =
  33. 33.Half of 188 =
  34. 34.Double 48 =
  35. 35.Double 63 =
  36. 36.Half of 114 =
  37. 37.Half of 64 =
  38. 38.Double 55 =
  39. 39.Double 43 =
  40. 40.Double 82 =

Answer key

  1. 142
  2. 49
  3. 64
  4. 56
  5. 44
  6. 166
  7. 162
  8. 52
  9. 82
  10. 32
  11. 134
  12. 58
  13. 43
  14. 50
  15. 79
  16. 136
  17. 198
  18. 15
  19. 75
  20. 48
  21. 62
  22. 72
  23. 92
  24. 122
  25. 42
  26. 53
  27. 29
  28. 48
  29. 130
  30. 27
  31. 17
  32. 150
  33. 94
  34. 96
  35. 126
  36. 57
  37. 32
  38. 110
  39. 86
  40. 164

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