← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 908 · 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 138 =
  2. 2.Half of 74 =
  3. 3.Half of 84 =
  4. 4.Double 86 =
  5. 5.Half of 40 =
  6. 6.Half of 92 =
  7. 7.Double 94 =
  8. 8.Double 87 =
  9. 9.Double 99 =
  10. 10.Double 51 =
  11. 11.Half of 28 =
  12. 12.Double 25 =
  13. 13.Half of 176 =
  14. 14.Half of 42 =
  15. 15.Half of 188 =
  16. 16.Half of 158 =
  17. 17.Half of 66 =
  18. 18.Half of 88 =
  19. 19.Double 69 =
  20. 20.Double 81 =
  21. 21.Half of 146 =
  22. 22.Double 28 =
  23. 23.Double 23 =
  24. 24.Double 68 =
  25. 25.Half of 168 =
  26. 26.Half of 170 =
  27. 27.Double 95 =
  28. 28.Half of 94 =
  29. 29.Double 49 =
  30. 30.Double 52 =
  31. 31.Double 83 =
  32. 32.Double 32 =
  33. 33.Half of 110 =
  34. 34.Double 22 =
  35. 35.Double 56 =
  36. 36.Double 31 =
  37. 37.Half of 60 =
  38. 38.Double 42 =
  39. 39.Double 89 =
  40. 40.Double 35 =

Answer key

  1. 69
  2. 37
  3. 42
  4. 172
  5. 20
  6. 46
  7. 188
  8. 174
  9. 198
  10. 102
  11. 14
  12. 50
  13. 88
  14. 21
  15. 94
  16. 79
  17. 33
  18. 44
  19. 138
  20. 162
  21. 73
  22. 56
  23. 46
  24. 136
  25. 84
  26. 85
  27. 190
  28. 47
  29. 98
  30. 104
  31. 166
  32. 64
  33. 55
  34. 44
  35. 112
  36. 62
  37. 30
  38. 84
  39. 178
  40. 70

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