← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 837 · 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 61 =
  2. 2.Half of 126 =
  3. 3.Half of 64 =
  4. 4.Half of 68 =
  5. 5.Half of 156 =
  6. 6.Half of 54 =
  7. 7.Half of 66 =
  8. 8.Double 74 =
  9. 9.Half of 86 =
  10. 10.Double 39 =
  11. 11.Double 42 =
  12. 12.Double 44 =
  13. 13.Half of 174 =
  14. 14.Double 17 =
  15. 15.Double 45 =
  16. 16.Half of 50 =
  17. 17.Half of 38 =
  18. 18.Double 57 =
  19. 19.Double 41 =
  20. 20.Double 99 =
  21. 21.Half of 178 =
  22. 22.Half of 120 =
  23. 23.Double 95 =
  24. 24.Double 21 =
  25. 25.Double 91 =
  26. 26.Double 69 =
  27. 27.Half of 92 =
  28. 28.Half of 172 =
  29. 29.Double 47 =
  30. 30.Double 71 =
  31. 31.Half of 90 =
  32. 32.Double 86 =
  33. 33.Half of 188 =
  34. 34.Double 81 =
  35. 35.Double 23 =
  36. 36.Double 31 =
  37. 37.Half of 198 =
  38. 38.Double 52 =
  39. 39.Double 59 =
  40. 40.Double 36 =

Answer key

  1. 122
  2. 63
  3. 32
  4. 34
  5. 78
  6. 27
  7. 33
  8. 148
  9. 43
  10. 78
  11. 84
  12. 88
  13. 87
  14. 34
  15. 90
  16. 25
  17. 19
  18. 114
  19. 82
  20. 198
  21. 89
  22. 60
  23. 190
  24. 42
  25. 182
  26. 138
  27. 46
  28. 86
  29. 94
  30. 142
  31. 45
  32. 172
  33. 94
  34. 162
  35. 46
  36. 62
  37. 99
  38. 104
  39. 118
  40. 72

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