← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 889 · 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 172 =
  2. 2.Half of 78 =
  3. 3.Half of 178 =
  4. 4.Half of 80 =
  5. 5.Double 84 =
  6. 6.Double 82 =
  7. 7.Half of 34 =
  8. 8.Half of 176 =
  9. 9.Half of 140 =
  10. 10.Double 22 =
  11. 11.Double 24 =
  12. 12.Half of 54 =
  13. 13.Double 35 =
  14. 14.Half of 128 =
  15. 15.Double 77 =
  16. 16.Half of 150 =
  17. 17.Half of 148 =
  18. 18.Double 39 =
  19. 19.Double 91 =
  20. 20.Double 74 =
  21. 21.Half of 122 =
  22. 22.Double 41 =
  23. 23.Double 78 =
  24. 24.Half of 36 =
  25. 25.Double 47 =
  26. 26.Double 21 =
  27. 27.Half of 98 =
  28. 28.Half of 58 =
  29. 29.Double 43 =
  30. 30.Double 75 =
  31. 31.Double 72 =
  32. 32.Double 96 =
  33. 33.Double 59 =
  34. 34.Half of 182 =
  35. 35.Half of 154 =
  36. 36.Double 31 =
  37. 37.Half of 118 =
  38. 38.Half of 184 =
  39. 39.Half of 158 =
  40. 40.Half of 30 =

Answer key

  1. 86
  2. 39
  3. 89
  4. 40
  5. 168
  6. 164
  7. 17
  8. 88
  9. 70
  10. 44
  11. 48
  12. 27
  13. 70
  14. 64
  15. 154
  16. 75
  17. 74
  18. 78
  19. 182
  20. 148
  21. 61
  22. 82
  23. 156
  24. 18
  25. 94
  26. 42
  27. 49
  28. 29
  29. 86
  30. 150
  31. 144
  32. 192
  33. 118
  34. 91
  35. 77
  36. 62
  37. 59
  38. 92
  39. 79
  40. 15

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