← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 433 · 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 29 =
  2. 2.Half of 76 =
  3. 3.Double 36 =
  4. 4.Half of 90 =
  5. 5.Half of 100 =
  6. 6.Half of 26 =
  7. 7.Double 79 =
  8. 8.Half of 44 =
  9. 9.Double 22 =
  10. 10.Half of 134 =
  11. 11.Half of 144 =
  12. 12.Half of 28 =
  13. 13.Double 57 =
  14. 14.Half of 56 =
  15. 15.Half of 140 =
  16. 16.Half of 92 =
  17. 17.Double 48 =
  18. 18.Half of 188 =
  19. 19.Double 23 =
  20. 20.Half of 70 =
  21. 21.Double 74 =
  22. 22.Double 71 =
  23. 23.Double 54 =
  24. 24.Double 91 =
  25. 25.Double 45 =
  26. 26.Half of 176 =
  27. 27.Half of 80 =
  28. 28.Double 63 =
  29. 29.Half of 136 =
  30. 30.Double 83 =
  31. 31.Half of 180 =
  32. 32.Double 65 =
  33. 33.Half of 192 =
  34. 34.Double 19 =
  35. 35.Double 42 =
  36. 36.Double 56 =
  37. 37.Half of 46 =
  38. 38.Half of 50 =
  39. 39.Double 58 =
  40. 40.Double 84 =

Answer key

  1. 58
  2. 38
  3. 72
  4. 45
  5. 50
  6. 13
  7. 158
  8. 22
  9. 44
  10. 67
  11. 72
  12. 14
  13. 114
  14. 28
  15. 70
  16. 46
  17. 96
  18. 94
  19. 46
  20. 35
  21. 148
  22. 142
  23. 108
  24. 182
  25. 90
  26. 88
  27. 40
  28. 126
  29. 68
  30. 166
  31. 90
  32. 130
  33. 96
  34. 38
  35. 84
  36. 112
  37. 23
  38. 25
  39. 116
  40. 168

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