← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 448 · 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 92 =
  2. 2.Double 17 =
  3. 3.Half of 176 =
  4. 4.Half of 112 =
  5. 5.Double 37 =
  6. 6.Half of 42 =
  7. 7.Half of 88 =
  8. 8.Half of 62 =
  9. 9.Half of 46 =
  10. 10.Double 52 =
  11. 11.Half of 82 =
  12. 12.Double 24 =
  13. 13.Half of 108 =
  14. 14.Half of 146 =
  15. 15.Half of 160 =
  16. 16.Half of 26 =
  17. 17.Half of 96 =
  18. 18.Double 69 =
  19. 19.Half of 154 =
  20. 20.Double 42 =
  21. 21.Double 46 =
  22. 22.Double 57 =
  23. 23.Double 71 =
  24. 24.Half of 70 =
  25. 25.Half of 66 =
  26. 26.Double 23 =
  27. 27.Half of 120 =
  28. 28.Half of 124 =
  29. 29.Double 61 =
  30. 30.Double 81 =
  31. 31.Double 16 =
  32. 32.Half of 150 =
  33. 33.Double 99 =
  34. 34.Half of 102 =
  35. 35.Double 87 =
  36. 36.Half of 68 =
  37. 37.Half of 168 =
  38. 38.Double 31 =
  39. 39.Double 47 =
  40. 40.Half of 138 =

Answer key

  1. 184
  2. 34
  3. 88
  4. 56
  5. 74
  6. 21
  7. 44
  8. 31
  9. 23
  10. 104
  11. 41
  12. 48
  13. 54
  14. 73
  15. 80
  16. 13
  17. 48
  18. 138
  19. 77
  20. 84
  21. 92
  22. 114
  23. 142
  24. 35
  25. 33
  26. 46
  27. 60
  28. 62
  29. 122
  30. 162
  31. 32
  32. 75
  33. 198
  34. 51
  35. 174
  36. 34
  37. 84
  38. 62
  39. 94
  40. 69

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