← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 641 · 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 71 =
  2. 2.Half of 110 =
  3. 3.Half of 72 =
  4. 4.Double 86 =
  5. 5.Half of 64 =
  6. 6.Half of 122 =
  7. 7.Half of 82 =
  8. 8.Half of 180 =
  9. 9.Double 85 =
  10. 10.Double 78 =
  11. 11.Half of 92 =
  12. 12.Double 25 =
  13. 13.Double 19 =
  14. 14.Half of 184 =
  15. 15.Double 29 =
  16. 16.Double 37 =
  17. 17.Double 46 =
  18. 18.Half of 164 =
  19. 19.Half of 174 =
  20. 20.Double 21 =
  21. 21.Half of 116 =
  22. 22.Half of 60 =
  23. 23.Half of 130 =
  24. 24.Half of 178 =
  25. 25.Half of 86 =
  26. 26.Double 28 =
  27. 27.Half of 196 =
  28. 28.Half of 104 =
  29. 29.Double 23 =
  30. 30.Half of 150 =
  31. 31.Half of 36 =
  32. 32.Double 27 =
  33. 33.Double 41 =
  34. 34.Half of 108 =
  35. 35.Double 68 =
  36. 36.Double 97 =
  37. 37.Double 48 =
  38. 38.Half of 192 =
  39. 39.Double 72 =
  40. 40.Double 16 =

Answer key

  1. 142
  2. 55
  3. 36
  4. 172
  5. 32
  6. 61
  7. 41
  8. 90
  9. 170
  10. 156
  11. 46
  12. 50
  13. 38
  14. 92
  15. 58
  16. 74
  17. 92
  18. 82
  19. 87
  20. 42
  21. 58
  22. 30
  23. 65
  24. 89
  25. 43
  26. 56
  27. 98
  28. 52
  29. 46
  30. 75
  31. 18
  32. 54
  33. 82
  34. 54
  35. 136
  36. 194
  37. 96
  38. 96
  39. 144
  40. 32

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