← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 299 · 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 160 =
  2. 2.Half of 168 =
  3. 3.Double 91 =
  4. 4.Double 65 =
  5. 5.Double 58 =
  6. 6.Half of 142 =
  7. 7.Double 83 =
  8. 8.Half of 190 =
  9. 9.Half of 44 =
  10. 10.Half of 126 =
  11. 11.Half of 54 =
  12. 12.Half of 194 =
  13. 13.Half of 74 =
  14. 14.Double 34 =
  15. 15.Double 69 =
  16. 16.Half of 64 =
  17. 17.Double 36 =
  18. 18.Half of 60 =
  19. 19.Half of 184 =
  20. 20.Half of 146 =
  21. 21.Double 42 =
  22. 22.Double 33 =
  23. 23.Half of 188 =
  24. 24.Half of 112 =
  25. 25.Half of 180 =
  26. 26.Half of 30 =
  27. 27.Double 51 =
  28. 28.Double 57 =
  29. 29.Double 59 =
  30. 30.Half of 62 =
  31. 31.Double 53 =
  32. 32.Double 22 =
  33. 33.Half of 50 =
  34. 34.Double 89 =
  35. 35.Double 61 =
  36. 36.Double 56 =
  37. 37.Half of 174 =
  38. 38.Double 96 =
  39. 39.Double 16 =
  40. 40.Double 74 =

Answer key

  1. 80
  2. 84
  3. 182
  4. 130
  5. 116
  6. 71
  7. 166
  8. 95
  9. 22
  10. 63
  11. 27
  12. 97
  13. 37
  14. 68
  15. 138
  16. 32
  17. 72
  18. 30
  19. 92
  20. 73
  21. 84
  22. 66
  23. 94
  24. 56
  25. 90
  26. 15
  27. 102
  28. 114
  29. 118
  30. 31
  31. 106
  32. 44
  33. 25
  34. 178
  35. 122
  36. 112
  37. 87
  38. 192
  39. 32
  40. 148

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