← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 130 · 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 38 =
  2. 2.Half of 146 =
  3. 3.Half of 68 =
  4. 4.Double 32 =
  5. 5.Half of 90 =
  6. 6.Double 31 =
  7. 7.Double 53 =
  8. 8.Double 29 =
  9. 9.Double 95 =
  10. 10.Half of 32 =
  11. 11.Double 47 =
  12. 12.Double 81 =
  13. 13.Double 28 =
  14. 14.Double 79 =
  15. 15.Half of 66 =
  16. 16.Half of 148 =
  17. 17.Double 89 =
  18. 18.Half of 92 =
  19. 19.Double 77 =
  20. 20.Double 72 =
  21. 21.Double 96 =
  22. 22.Half of 40 =
  23. 23.Double 57 =
  24. 24.Half of 98 =
  25. 25.Half of 138 =
  26. 26.Double 74 =
  27. 27.Double 91 =
  28. 28.Double 23 =
  29. 29.Double 17 =
  30. 30.Double 71 =
  31. 31.Double 82 =
  32. 32.Half of 26 =
  33. 33.Double 49 =
  34. 34.Double 16 =
  35. 35.Double 22 =
  36. 36.Double 35 =
  37. 37.Double 58 =
  38. 38.Double 76 =
  39. 39.Half of 178 =
  40. 40.Double 51 =

Answer key

  1. 76
  2. 73
  3. 34
  4. 64
  5. 45
  6. 62
  7. 106
  8. 58
  9. 190
  10. 16
  11. 94
  12. 162
  13. 56
  14. 158
  15. 33
  16. 74
  17. 178
  18. 46
  19. 154
  20. 144
  21. 192
  22. 20
  23. 114
  24. 49
  25. 69
  26. 148
  27. 182
  28. 46
  29. 34
  30. 142
  31. 164
  32. 13
  33. 98
  34. 32
  35. 44
  36. 70
  37. 116
  38. 152
  39. 89
  40. 102

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