← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 617 · 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 57 =
  2. 2.Double 23 =
  3. 3.Double 67 =
  4. 4.Half of 184 =
  5. 5.Half of 42 =
  6. 6.Half of 166 =
  7. 7.Double 92 =
  8. 8.Half of 138 =
  9. 9.Half of 48 =
  10. 10.Double 29 =
  11. 11.Half of 32 =
  12. 12.Half of 154 =
  13. 13.Half of 56 =
  14. 14.Double 17 =
  15. 15.Half of 26 =
  16. 16.Double 68 =
  17. 17.Double 89 =
  18. 18.Half of 72 =
  19. 19.Double 91 =
  20. 20.Double 88 =
  21. 21.Half of 140 =
  22. 22.Double 37 =
  23. 23.Double 71 =
  24. 24.Double 75 =
  25. 25.Half of 54 =
  26. 26.Double 73 =
  27. 27.Half of 182 =
  28. 28.Half of 90 =
  29. 29.Double 18 =
  30. 30.Double 53 =
  31. 31.Double 51 =
  32. 32.Half of 194 =
  33. 33.Half of 76 =
  34. 34.Half of 152 =
  35. 35.Half of 52 =
  36. 36.Double 96 =
  37. 37.Half of 68 =
  38. 38.Double 62 =
  39. 39.Half of 144 =
  40. 40.Double 42 =

Answer key

  1. 114
  2. 46
  3. 134
  4. 92
  5. 21
  6. 83
  7. 184
  8. 69
  9. 24
  10. 58
  11. 16
  12. 77
  13. 28
  14. 34
  15. 13
  16. 136
  17. 178
  18. 36
  19. 182
  20. 176
  21. 70
  22. 74
  23. 142
  24. 150
  25. 27
  26. 146
  27. 91
  28. 45
  29. 36
  30. 106
  31. 102
  32. 97
  33. 38
  34. 76
  35. 26
  36. 192
  37. 34
  38. 124
  39. 72
  40. 84

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