← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 304 · 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 86 =
  2. 2.Double 19 =
  3. 3.Half of 76 =
  4. 4.Double 34 =
  5. 5.Half of 182 =
  6. 6.Double 77 =
  7. 7.Double 58 =
  8. 8.Double 67 =
  9. 9.Half of 116 =
  10. 10.Double 31 =
  11. 11.Half of 192 =
  12. 12.Double 81 =
  13. 13.Half of 172 =
  14. 14.Double 91 =
  15. 15.Double 93 =
  16. 16.Half of 108 =
  17. 17.Half of 150 =
  18. 18.Half of 68 =
  19. 19.Double 47 =
  20. 20.Half of 48 =
  21. 21.Half of 62 =
  22. 22.Half of 92 =
  23. 23.Half of 176 =
  24. 24.Double 41 =
  25. 25.Half of 54 =
  26. 26.Half of 60 =
  27. 27.Half of 34 =
  28. 28.Double 37 =
  29. 29.Half of 158 =
  30. 30.Half of 80 =
  31. 31.Double 64 =
  32. 32.Half of 64 =
  33. 33.Half of 164 =
  34. 34.Half of 70 =
  35. 35.Half of 110 =
  36. 36.Double 44 =
  37. 37.Half of 168 =
  38. 38.Half of 146 =
  39. 39.Double 23 =
  40. 40.Double 62 =

Answer key

  1. 172
  2. 38
  3. 38
  4. 68
  5. 91
  6. 154
  7. 116
  8. 134
  9. 58
  10. 62
  11. 96
  12. 162
  13. 86
  14. 182
  15. 186
  16. 54
  17. 75
  18. 34
  19. 94
  20. 24
  21. 31
  22. 46
  23. 88
  24. 82
  25. 27
  26. 30
  27. 17
  28. 74
  29. 79
  30. 40
  31. 128
  32. 32
  33. 82
  34. 35
  35. 55
  36. 88
  37. 84
  38. 73
  39. 46
  40. 124

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