← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 765 · 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.Half of 136 =
  2. 2.Half of 198 =
  3. 3.Double 21 =
  4. 4.Half of 62 =
  5. 5.Double 35 =
  6. 6.Double 72 =
  7. 7.Double 17 =
  8. 8.Double 34 =
  9. 9.Double 61 =
  10. 10.Double 51 =
  11. 11.Half of 88 =
  12. 12.Half of 86 =
  13. 13.Half of 58 =
  14. 14.Double 25 =
  15. 15.Double 27 =
  16. 16.Double 33 =
  17. 17.Double 82 =
  18. 18.Half of 162 =
  19. 19.Double 84 =
  20. 20.Double 65 =
  21. 21.Double 31 =
  22. 22.Double 87 =
  23. 23.Half of 130 =
  24. 24.Double 47 =
  25. 25.Half of 76 =
  26. 26.Half of 80 =
  27. 27.Half of 38 =
  28. 28.Double 79 =
  29. 29.Double 63 =
  30. 30.Half of 34 =
  31. 31.Double 39 =
  32. 32.Half of 94 =
  33. 33.Double 85 =
  34. 34.Double 93 =
  35. 35.Double 43 =
  36. 36.Double 49 =
  37. 37.Half of 82 =
  38. 38.Half of 138 =
  39. 39.Double 78 =
  40. 40.Double 86 =

Answer key

  1. 68
  2. 99
  3. 42
  4. 31
  5. 70
  6. 144
  7. 34
  8. 68
  9. 122
  10. 102
  11. 44
  12. 43
  13. 29
  14. 50
  15. 54
  16. 66
  17. 164
  18. 81
  19. 168
  20. 130
  21. 62
  22. 174
  23. 65
  24. 94
  25. 38
  26. 40
  27. 19
  28. 158
  29. 126
  30. 17
  31. 78
  32. 47
  33. 170
  34. 186
  35. 86
  36. 98
  37. 41
  38. 69
  39. 156
  40. 172

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