← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 63 · 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 50 =
  2. 2.Half of 132 =
  3. 3.Double 43 =
  4. 4.Double 91 =
  5. 5.Half of 78 =
  6. 6.Double 23 =
  7. 7.Half of 72 =
  8. 8.Double 39 =
  9. 9.Half of 76 =
  10. 10.Half of 160 =
  11. 11.Double 28 =
  12. 12.Double 61 =
  13. 13.Half of 118 =
  14. 14.Double 65 =
  15. 15.Half of 188 =
  16. 16.Double 45 =
  17. 17.Double 31 =
  18. 18.Half of 32 =
  19. 19.Double 59 =
  20. 20.Half of 186 =
  21. 21.Half of 180 =
  22. 22.Half of 168 =
  23. 23.Half of 138 =
  24. 24.Half of 56 =
  25. 25.Double 16 =
  26. 26.Half of 156 =
  27. 27.Double 51 =
  28. 28.Half of 84 =
  29. 29.Half of 190 =
  30. 30.Half of 44 =
  31. 31.Half of 144 =
  32. 32.Double 56 =
  33. 33.Half of 70 =
  34. 34.Double 58 =
  35. 35.Half of 40 =
  36. 36.Double 17 =
  37. 37.Double 94 =
  38. 38.Half of 150 =
  39. 39.Double 81 =
  40. 40.Half of 148 =

Answer key

  1. 25
  2. 66
  3. 86
  4. 182
  5. 39
  6. 46
  7. 36
  8. 78
  9. 38
  10. 80
  11. 56
  12. 122
  13. 59
  14. 130
  15. 94
  16. 90
  17. 62
  18. 16
  19. 118
  20. 93
  21. 90
  22. 84
  23. 69
  24. 28
  25. 32
  26. 78
  27. 102
  28. 42
  29. 95
  30. 22
  31. 72
  32. 112
  33. 35
  34. 116
  35. 20
  36. 34
  37. 188
  38. 75
  39. 162
  40. 74

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