← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 492 · 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 35 =
  2. 2.Half of 174 =
  3. 3.Double 58 =
  4. 4.Double 71 =
  5. 5.Half of 166 =
  6. 6.Half of 52 =
  7. 7.Double 41 =
  8. 8.Half of 82 =
  9. 9.Half of 148 =
  10. 10.Double 32 =
  11. 11.Double 31 =
  12. 12.Double 47 =
  13. 13.Double 81 =
  14. 14.Half of 34 =
  15. 15.Double 54 =
  16. 16.Half of 44 =
  17. 17.Double 28 =
  18. 18.Double 53 =
  19. 19.Double 79 =
  20. 20.Double 86 =
  21. 21.Double 24 =
  22. 22.Double 42 =
  23. 23.Double 29 =
  24. 24.Half of 132 =
  25. 25.Half of 162 =
  26. 26.Double 95 =
  27. 27.Double 51 =
  28. 28.Half of 76 =
  29. 29.Half of 196 =
  30. 30.Double 23 =
  31. 31.Half of 100 =
  32. 32.Double 56 =
  33. 33.Half of 60 =
  34. 34.Double 88 =
  35. 35.Double 52 =
  36. 36.Double 91 =
  37. 37.Half of 92 =
  38. 38.Double 65 =
  39. 39.Double 82 =
  40. 40.Half of 78 =

Answer key

  1. 70
  2. 87
  3. 116
  4. 142
  5. 83
  6. 26
  7. 82
  8. 41
  9. 74
  10. 64
  11. 62
  12. 94
  13. 162
  14. 17
  15. 108
  16. 22
  17. 56
  18. 106
  19. 158
  20. 172
  21. 48
  22. 84
  23. 58
  24. 66
  25. 81
  26. 190
  27. 102
  28. 38
  29. 98
  30. 46
  31. 50
  32. 112
  33. 30
  34. 176
  35. 104
  36. 182
  37. 46
  38. 130
  39. 164
  40. 39

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