← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 136 · 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 162 =
  2. 2.Double 51 =
  3. 3.Double 53 =
  4. 4.Double 47 =
  5. 5.Half of 188 =
  6. 6.Double 93 =
  7. 7.Half of 192 =
  8. 8.Double 73 =
  9. 9.Double 28 =
  10. 10.Half of 170 =
  11. 11.Half of 28 =
  12. 12.Half of 128 =
  13. 13.Half of 130 =
  14. 14.Double 75 =
  15. 15.Double 49 =
  16. 16.Double 64 =
  17. 17.Half of 142 =
  18. 18.Double 59 =
  19. 19.Half of 84 =
  20. 20.Double 69 =
  21. 21.Double 83 =
  22. 22.Double 29 =
  23. 23.Half of 136 =
  24. 24.Double 21 =
  25. 25.Double 85 =
  26. 26.Double 66 =
  27. 27.Half of 198 =
  28. 28.Double 17 =
  29. 29.Half of 150 =
  30. 30.Half of 138 =
  31. 31.Double 81 =
  32. 32.Half of 76 =
  33. 33.Half of 102 =
  34. 34.Half of 80 =
  35. 35.Double 65 =
  36. 36.Half of 68 =
  37. 37.Half of 50 =
  38. 38.Half of 176 =
  39. 39.Half of 116 =
  40. 40.Double 76 =

Answer key

  1. 81
  2. 102
  3. 106
  4. 94
  5. 94
  6. 186
  7. 96
  8. 146
  9. 56
  10. 85
  11. 14
  12. 64
  13. 65
  14. 150
  15. 98
  16. 128
  17. 71
  18. 118
  19. 42
  20. 138
  21. 166
  22. 58
  23. 68
  24. 42
  25. 170
  26. 132
  27. 99
  28. 34
  29. 75
  30. 69
  31. 162
  32. 38
  33. 51
  34. 40
  35. 130
  36. 34
  37. 25
  38. 88
  39. 58
  40. 152

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