← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 422 · 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 19 =
  2. 2.Double 21 =
  3. 3.Half of 166 =
  4. 4.Half of 196 =
  5. 5.Double 36 =
  6. 6.Double 89 =
  7. 7.Half of 72 =
  8. 8.Double 25 =
  9. 9.Half of 84 =
  10. 10.Half of 30 =
  11. 11.Half of 82 =
  12. 12.Double 61 =
  13. 13.Double 51 =
  14. 14.Half of 174 =
  15. 15.Half of 44 =
  16. 16.Half of 88 =
  17. 17.Half of 100 =
  18. 18.Double 53 =
  19. 19.Half of 86 =
  20. 20.Half of 64 =
  21. 21.Half of 138 =
  22. 22.Double 81 =
  23. 23.Double 71 =
  24. 24.Double 34 =
  25. 25.Half of 104 =
  26. 26.Half of 98 =
  27. 27.Double 56 =
  28. 28.Half of 122 =
  29. 29.Double 62 =
  30. 30.Double 87 =
  31. 31.Half of 178 =
  32. 32.Double 28 =
  33. 33.Double 23 =
  34. 34.Double 91 =
  35. 35.Half of 176 =
  36. 36.Double 26 =
  37. 37.Double 16 =
  38. 38.Half of 130 =
  39. 39.Double 47 =
  40. 40.Half of 54 =

Answer key

  1. 38
  2. 42
  3. 83
  4. 98
  5. 72
  6. 178
  7. 36
  8. 50
  9. 42
  10. 15
  11. 41
  12. 122
  13. 102
  14. 87
  15. 22
  16. 44
  17. 50
  18. 106
  19. 43
  20. 32
  21. 69
  22. 162
  23. 142
  24. 68
  25. 52
  26. 49
  27. 112
  28. 61
  29. 124
  30. 174
  31. 89
  32. 56
  33. 46
  34. 182
  35. 88
  36. 52
  37. 32
  38. 65
  39. 94
  40. 27

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