← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 844 · 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 62 =
  2. 2.Double 22 =
  3. 3.Double 88 =
  4. 4.Half of 62 =
  5. 5.Double 95 =
  6. 6.Half of 90 =
  7. 7.Half of 116 =
  8. 8.Double 29 =
  9. 9.Double 41 =
  10. 10.Double 39 =
  11. 11.Double 54 =
  12. 12.Half of 158 =
  13. 13.Half of 42 =
  14. 14.Half of 44 =
  15. 15.Double 36 =
  16. 16.Double 89 =
  17. 17.Half of 136 =
  18. 18.Half of 98 =
  19. 19.Half of 58 =
  20. 20.Double 86 =
  21. 21.Double 94 =
  22. 22.Double 68 =
  23. 23.Double 83 =
  24. 24.Half of 184 =
  25. 25.Half of 32 =
  26. 26.Double 69 =
  27. 27.Double 35 =
  28. 28.Half of 28 =
  29. 29.Double 26 =
  30. 30.Double 47 =
  31. 31.Double 48 =
  32. 32.Double 91 =
  33. 33.Half of 34 =
  34. 34.Half of 60 =
  35. 35.Half of 64 =
  36. 36.Half of 50 =
  37. 37.Half of 26 =
  38. 38.Half of 178 =
  39. 39.Half of 110 =
  40. 40.Half of 120 =

Answer key

  1. 124
  2. 44
  3. 176
  4. 31
  5. 190
  6. 45
  7. 58
  8. 58
  9. 82
  10. 78
  11. 108
  12. 79
  13. 21
  14. 22
  15. 72
  16. 178
  17. 68
  18. 49
  19. 29
  20. 172
  21. 188
  22. 136
  23. 166
  24. 92
  25. 16
  26. 138
  27. 70
  28. 14
  29. 52
  30. 94
  31. 96
  32. 182
  33. 17
  34. 30
  35. 32
  36. 25
  37. 13
  38. 89
  39. 55
  40. 60

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