← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 210 · 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 93 =
  2. 2.Half of 86 =
  3. 3.Half of 42 =
  4. 4.Double 16 =
  5. 5.Half of 88 =
  6. 6.Half of 48 =
  7. 7.Half of 116 =
  8. 8.Double 25 =
  9. 9.Half of 136 =
  10. 10.Half of 62 =
  11. 11.Double 39 =
  12. 12.Half of 38 =
  13. 13.Half of 26 =
  14. 14.Double 89 =
  15. 15.Half of 184 =
  16. 16.Half of 44 =
  17. 17.Half of 170 =
  18. 18.Half of 132 =
  19. 19.Half of 134 =
  20. 20.Double 27 =
  21. 21.Double 94 =
  22. 22.Half of 152 =
  23. 23.Double 28 =
  24. 24.Double 79 =
  25. 25.Double 33 =
  26. 26.Double 42 =
  27. 27.Double 82 =
  28. 28.Double 75 =
  29. 29.Half of 110 =
  30. 30.Half of 82 =
  31. 31.Half of 64 =
  32. 32.Double 81 =
  33. 33.Double 22 =
  34. 34.Half of 30 =
  35. 35.Double 58 =
  36. 36.Double 96 =
  37. 37.Double 35 =
  38. 38.Half of 100 =
  39. 39.Double 46 =
  40. 40.Double 41 =

Answer key

  1. 186
  2. 43
  3. 21
  4. 32
  5. 44
  6. 24
  7. 58
  8. 50
  9. 68
  10. 31
  11. 78
  12. 19
  13. 13
  14. 178
  15. 92
  16. 22
  17. 85
  18. 66
  19. 67
  20. 54
  21. 188
  22. 76
  23. 56
  24. 158
  25. 66
  26. 84
  27. 164
  28. 150
  29. 55
  30. 41
  31. 32
  32. 162
  33. 44
  34. 15
  35. 116
  36. 192
  37. 70
  38. 50
  39. 92
  40. 82

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