← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 987 · 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 62 =
  2. 2.Double 88 =
  3. 3.Half of 150 =
  4. 4.Double 75 =
  5. 5.Half of 106 =
  6. 6.Half of 94 =
  7. 7.Double 24 =
  8. 8.Half of 28 =
  9. 9.Half of 86 =
  10. 10.Double 26 =
  11. 11.Half of 50 =
  12. 12.Half of 76 =
  13. 13.Double 76 =
  14. 14.Double 41 =
  15. 15.Double 23 =
  16. 16.Double 19 =
  17. 17.Half of 52 =
  18. 18.Double 38 =
  19. 19.Half of 38 =
  20. 20.Half of 102 =
  21. 21.Half of 36 =
  22. 22.Half of 130 =
  23. 23.Double 39 =
  24. 24.Double 65 =
  25. 25.Double 32 =
  26. 26.Double 93 =
  27. 27.Double 78 =
  28. 28.Double 31 =
  29. 29.Half of 152 =
  30. 30.Half of 180 =
  31. 31.Double 34 =
  32. 32.Half of 30 =
  33. 33.Half of 44 =
  34. 34.Half of 186 =
  35. 35.Double 85 =
  36. 36.Double 91 =
  37. 37.Double 61 =
  38. 38.Double 67 =
  39. 39.Half of 118 =
  40. 40.Half of 112 =

Answer key

  1. 124
  2. 176
  3. 75
  4. 150
  5. 53
  6. 47
  7. 48
  8. 14
  9. 43
  10. 52
  11. 25
  12. 38
  13. 152
  14. 82
  15. 46
  16. 38
  17. 26
  18. 76
  19. 19
  20. 51
  21. 18
  22. 65
  23. 78
  24. 130
  25. 64
  26. 186
  27. 156
  28. 62
  29. 76
  30. 90
  31. 68
  32. 15
  33. 22
  34. 93
  35. 170
  36. 182
  37. 122
  38. 134
  39. 59
  40. 56

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