← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 430 · 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 28 =
  2. 2.Half of 70 =
  3. 3.Half of 64 =
  4. 4.Double 43 =
  5. 5.Half of 96 =
  6. 6.Half of 130 =
  7. 7.Half of 152 =
  8. 8.Half of 80 =
  9. 9.Double 85 =
  10. 10.Half of 160 =
  11. 11.Double 62 =
  12. 12.Double 25 =
  13. 13.Double 64 =
  14. 14.Half of 102 =
  15. 15.Double 39 =
  16. 16.Half of 66 =
  17. 17.Double 76 =
  18. 18.Double 78 =
  19. 19.Double 72 =
  20. 20.Half of 154 =
  21. 21.Half of 84 =
  22. 22.Double 35 =
  23. 23.Double 34 =
  24. 24.Half of 82 =
  25. 25.Half of 50 =
  26. 26.Half of 194 =
  27. 27.Double 68 =
  28. 28.Half of 30 =
  29. 29.Half of 192 =
  30. 30.Half of 148 =
  31. 31.Half of 142 =
  32. 32.Double 37 =
  33. 33.Half of 186 =
  34. 34.Half of 166 =
  35. 35.Half of 44 =
  36. 36.Double 99 =
  37. 37.Double 18 =
  38. 38.Half of 54 =
  39. 39.Half of 164 =
  40. 40.Double 81 =

Answer key

  1. 14
  2. 35
  3. 32
  4. 86
  5. 48
  6. 65
  7. 76
  8. 40
  9. 170
  10. 80
  11. 124
  12. 50
  13. 128
  14. 51
  15. 78
  16. 33
  17. 152
  18. 156
  19. 144
  20. 77
  21. 42
  22. 70
  23. 68
  24. 41
  25. 25
  26. 97
  27. 136
  28. 15
  29. 96
  30. 74
  31. 71
  32. 74
  33. 93
  34. 83
  35. 22
  36. 198
  37. 36
  38. 27
  39. 82
  40. 162

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