← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 252 · 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 56 =
  2. 2.Half of 166 =
  3. 3.Double 94 =
  4. 4.Double 63 =
  5. 5.Half of 126 =
  6. 6.Half of 38 =
  7. 7.Half of 168 =
  8. 8.Double 21 =
  9. 9.Double 97 =
  10. 10.Half of 112 =
  11. 11.Half of 78 =
  12. 12.Double 81 =
  13. 13.Double 31 =
  14. 14.Half of 92 =
  15. 15.Double 57 =
  16. 16.Double 65 =
  17. 17.Double 49 =
  18. 18.Half of 180 =
  19. 19.Half of 196 =
  20. 20.Half of 192 =
  21. 21.Double 82 =
  22. 22.Half of 170 =
  23. 23.Half of 184 =
  24. 24.Double 58 =
  25. 25.Double 33 =
  26. 26.Half of 146 =
  27. 27.Double 55 =
  28. 28.Double 51 =
  29. 29.Half of 48 =
  30. 30.Half of 34 =
  31. 31.Double 22 =
  32. 32.Half of 74 =
  33. 33.Half of 50 =
  34. 34.Half of 132 =
  35. 35.Double 64 =
  36. 36.Double 83 =
  37. 37.Double 71 =
  38. 38.Half of 68 =
  39. 39.Double 44 =
  40. 40.Double 91 =

Answer key

  1. 28
  2. 83
  3. 188
  4. 126
  5. 63
  6. 19
  7. 84
  8. 42
  9. 194
  10. 56
  11. 39
  12. 162
  13. 62
  14. 46
  15. 114
  16. 130
  17. 98
  18. 90
  19. 98
  20. 96
  21. 164
  22. 85
  23. 92
  24. 116
  25. 66
  26. 73
  27. 110
  28. 102
  29. 24
  30. 17
  31. 44
  32. 37
  33. 25
  34. 66
  35. 128
  36. 166
  37. 142
  38. 34
  39. 88
  40. 182

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