← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 135 · 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 164 =
  2. 2.Double 73 =
  3. 3.Double 16 =
  4. 4.Double 25 =
  5. 5.Half of 106 =
  6. 6.Half of 148 =
  7. 7.Half of 82 =
  8. 8.Half of 94 =
  9. 9.Half of 78 =
  10. 10.Double 76 =
  11. 11.Half of 90 =
  12. 12.Double 51 =
  13. 13.Half of 56 =
  14. 14.Half of 96 =
  15. 15.Double 43 =
  16. 16.Double 32 =
  17. 17.Double 54 =
  18. 18.Half of 190 =
  19. 19.Double 56 =
  20. 20.Double 47 =
  21. 21.Double 48 =
  22. 22.Half of 62 =
  23. 23.Double 79 =
  24. 24.Half of 114 =
  25. 25.Half of 198 =
  26. 26.Double 67 =
  27. 27.Half of 140 =
  28. 28.Double 64 =
  29. 29.Double 45 =
  30. 30.Half of 26 =
  31. 31.Half of 146 =
  32. 32.Half of 126 =
  33. 33.Half of 102 =
  34. 34.Double 69 =
  35. 35.Double 74 =
  36. 36.Half of 32 =
  37. 37.Double 66 =
  38. 38.Half of 110 =
  39. 39.Double 21 =
  40. 40.Half of 64 =

Answer key

  1. 82
  2. 146
  3. 32
  4. 50
  5. 53
  6. 74
  7. 41
  8. 47
  9. 39
  10. 152
  11. 45
  12. 102
  13. 28
  14. 48
  15. 86
  16. 64
  17. 108
  18. 95
  19. 112
  20. 94
  21. 96
  22. 31
  23. 158
  24. 57
  25. 99
  26. 134
  27. 70
  28. 128
  29. 90
  30. 13
  31. 73
  32. 63
  33. 51
  34. 138
  35. 148
  36. 16
  37. 132
  38. 55
  39. 42
  40. 32

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