← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 116 · 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 76 =
  2. 2.Half of 86 =
  3. 3.Double 73 =
  4. 4.Half of 168 =
  5. 5.Double 62 =
  6. 6.Double 77 =
  7. 7.Double 46 =
  8. 8.Double 31 =
  9. 9.Half of 58 =
  10. 10.Half of 166 =
  11. 11.Half of 198 =
  12. 12.Half of 162 =
  13. 13.Double 39 =
  14. 14.Double 86 =
  15. 15.Double 76 =
  16. 16.Double 66 =
  17. 17.Half of 104 =
  18. 18.Half of 92 =
  19. 19.Half of 126 =
  20. 20.Double 55 =
  21. 21.Half of 142 =
  22. 22.Half of 154 =
  23. 23.Double 27 =
  24. 24.Double 61 =
  25. 25.Double 51 =
  26. 26.Half of 130 =
  27. 27.Half of 34 =
  28. 28.Half of 170 =
  29. 29.Half of 114 =
  30. 30.Double 19 =
  31. 31.Half of 70 =
  32. 32.Half of 194 =
  33. 33.Double 49 =
  34. 34.Half of 36 =
  35. 35.Double 84 =
  36. 36.Half of 46 =
  37. 37.Double 52 =
  38. 38.Double 72 =
  39. 39.Double 21 =
  40. 40.Half of 100 =

Answer key

  1. 38
  2. 43
  3. 146
  4. 84
  5. 124
  6. 154
  7. 92
  8. 62
  9. 29
  10. 83
  11. 99
  12. 81
  13. 78
  14. 172
  15. 152
  16. 132
  17. 52
  18. 46
  19. 63
  20. 110
  21. 71
  22. 77
  23. 54
  24. 122
  25. 102
  26. 65
  27. 17
  28. 85
  29. 57
  30. 38
  31. 35
  32. 97
  33. 98
  34. 18
  35. 168
  36. 23
  37. 104
  38. 144
  39. 42
  40. 50

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