← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 117 · 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.Double 78 =
  2. 2.Double 52 =
  3. 3.Half of 26 =
  4. 4.Double 98 =
  5. 5.Double 36 =
  6. 6.Double 68 =
  7. 7.Double 79 =
  8. 8.Half of 102 =
  9. 9.Half of 62 =
  10. 10.Double 53 =
  11. 11.Double 71 =
  12. 12.Double 86 =
  13. 13.Double 41 =
  14. 14.Half of 154 =
  15. 15.Half of 144 =
  16. 16.Half of 28 =
  17. 17.Half of 38 =
  18. 18.Half of 148 =
  19. 19.Double 54 =
  20. 20.Double 34 =
  21. 21.Half of 108 =
  22. 22.Double 96 =
  23. 23.Half of 80 =
  24. 24.Half of 176 =
  25. 25.Double 28 =
  26. 26.Double 88 =
  27. 27.Half of 66 =
  28. 28.Double 55 =
  29. 29.Half of 180 =
  30. 30.Half of 146 =
  31. 31.Half of 168 =
  32. 32.Double 49 =
  33. 33.Double 33 =
  34. 34.Half of 158 =
  35. 35.Half of 50 =
  36. 36.Half of 88 =
  37. 37.Double 94 =
  38. 38.Half of 64 =
  39. 39.Double 81 =
  40. 40.Double 39 =

Answer key

  1. 156
  2. 104
  3. 13
  4. 196
  5. 72
  6. 136
  7. 158
  8. 51
  9. 31
  10. 106
  11. 142
  12. 172
  13. 82
  14. 77
  15. 72
  16. 14
  17. 19
  18. 74
  19. 108
  20. 68
  21. 54
  22. 192
  23. 40
  24. 88
  25. 56
  26. 176
  27. 33
  28. 110
  29. 90
  30. 73
  31. 84
  32. 98
  33. 66
  34. 79
  35. 25
  36. 44
  37. 188
  38. 32
  39. 162
  40. 78

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