← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 125 · 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 31 =
  2. 2.Half of 90 =
  3. 3.Half of 176 =
  4. 4.Double 77 =
  5. 5.Double 38 =
  6. 6.Half of 100 =
  7. 7.Double 52 =
  8. 8.Half of 32 =
  9. 9.Double 72 =
  10. 10.Half of 66 =
  11. 11.Double 42 =
  12. 12.Half of 108 =
  13. 13.Half of 74 =
  14. 14.Half of 54 =
  15. 15.Double 16 =
  16. 16.Half of 126 =
  17. 17.Double 92 =
  18. 18.Half of 44 =
  19. 19.Half of 58 =
  20. 20.Double 22 =
  21. 21.Half of 122 =
  22. 22.Double 59 =
  23. 23.Double 45 =
  24. 24.Half of 38 =
  25. 25.Double 99 =
  26. 26.Double 81 =
  27. 27.Double 23 =
  28. 28.Double 78 =
  29. 29.Half of 164 =
  30. 30.Half of 80 =
  31. 31.Half of 88 =
  32. 32.Double 26 =
  33. 33.Half of 110 =
  34. 34.Half of 98 =
  35. 35.Half of 192 =
  36. 36.Half of 184 =
  37. 37.Half of 96 =
  38. 38.Double 39 =
  39. 39.Half of 62 =
  40. 40.Double 61 =

Answer key

  1. 62
  2. 45
  3. 88
  4. 154
  5. 76
  6. 50
  7. 104
  8. 16
  9. 144
  10. 33
  11. 84
  12. 54
  13. 37
  14. 27
  15. 32
  16. 63
  17. 184
  18. 22
  19. 29
  20. 44
  21. 61
  22. 118
  23. 90
  24. 19
  25. 198
  26. 162
  27. 46
  28. 156
  29. 82
  30. 40
  31. 44
  32. 52
  33. 55
  34. 49
  35. 96
  36. 92
  37. 48
  38. 78
  39. 31
  40. 122

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