← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 108 · 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 126 =
  2. 2.Double 31 =
  3. 3.Double 53 =
  4. 4.Double 37 =
  5. 5.Double 72 =
  6. 6.Half of 78 =
  7. 7.Double 27 =
  8. 8.Double 78 =
  9. 9.Half of 50 =
  10. 10.Half of 114 =
  11. 11.Double 41 =
  12. 12.Half of 122 =
  13. 13.Double 83 =
  14. 14.Double 52 =
  15. 15.Half of 132 =
  16. 16.Half of 144 =
  17. 17.Half of 140 =
  18. 18.Half of 46 =
  19. 19.Half of 180 =
  20. 20.Double 28 =
  21. 21.Half of 36 =
  22. 22.Double 62 =
  23. 23.Half of 120 =
  24. 24.Half of 74 =
  25. 25.Half of 134 =
  26. 26.Half of 164 =
  27. 27.Half of 48 =
  28. 28.Half of 152 =
  29. 29.Double 61 =
  30. 30.Half of 56 =
  31. 31.Double 24 =
  32. 32.Double 21 =
  33. 33.Double 34 =
  34. 34.Half of 94 =
  35. 35.Half of 198 =
  36. 36.Half of 110 =
  37. 37.Half of 98 =
  38. 38.Double 49 =
  39. 39.Double 55 =
  40. 40.Half of 72 =

Answer key

  1. 63
  2. 62
  3. 106
  4. 74
  5. 144
  6. 39
  7. 54
  8. 156
  9. 25
  10. 57
  11. 82
  12. 61
  13. 166
  14. 104
  15. 66
  16. 72
  17. 70
  18. 23
  19. 90
  20. 56
  21. 18
  22. 124
  23. 60
  24. 37
  25. 67
  26. 82
  27. 24
  28. 76
  29. 122
  30. 28
  31. 48
  32. 42
  33. 68
  34. 47
  35. 99
  36. 55
  37. 49
  38. 98
  39. 110
  40. 36

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