← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 369 · 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 30 =
  2. 2.Half of 124 =
  3. 3.Double 65 =
  4. 4.Double 81 =
  5. 5.Double 63 =
  6. 6.Double 45 =
  7. 7.Half of 82 =
  8. 8.Double 23 =
  9. 9.Half of 72 =
  10. 10.Double 96 =
  11. 11.Double 26 =
  12. 12.Half of 40 =
  13. 13.Double 83 =
  14. 14.Half of 32 =
  15. 15.Double 19 =
  16. 16.Double 84 =
  17. 17.Half of 88 =
  18. 18.Double 72 =
  19. 19.Double 77 =
  20. 20.Double 64 =
  21. 21.Half of 140 =
  22. 22.Double 69 =
  23. 23.Double 47 =
  24. 24.Double 59 =
  25. 25.Double 24 =
  26. 26.Half of 84 =
  27. 27.Double 62 =
  28. 28.Half of 92 =
  29. 29.Double 68 =
  30. 30.Double 28 =
  31. 31.Double 25 =
  32. 32.Half of 190 =
  33. 33.Double 91 =
  34. 34.Double 41 =
  35. 35.Half of 174 =
  36. 36.Double 95 =
  37. 37.Half of 26 =
  38. 38.Double 86 =
  39. 39.Half of 48 =
  40. 40.Half of 46 =

Answer key

  1. 15
  2. 62
  3. 130
  4. 162
  5. 126
  6. 90
  7. 41
  8. 46
  9. 36
  10. 192
  11. 52
  12. 20
  13. 166
  14. 16
  15. 38
  16. 168
  17. 44
  18. 144
  19. 154
  20. 128
  21. 70
  22. 138
  23. 94
  24. 118
  25. 48
  26. 42
  27. 124
  28. 46
  29. 136
  30. 56
  31. 50
  32. 95
  33. 182
  34. 82
  35. 87
  36. 190
  37. 13
  38. 172
  39. 24
  40. 23

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