← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 786 · 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 42 =
  2. 2.Half of 86 =
  3. 3.Double 57 =
  4. 4.Half of 136 =
  5. 5.Half of 76 =
  6. 6.Double 77 =
  7. 7.Double 63 =
  8. 8.Half of 78 =
  9. 9.Half of 94 =
  10. 10.Half of 46 =
  11. 11.Double 96 =
  12. 12.Double 36 =
  13. 13.Half of 178 =
  14. 14.Double 65 =
  15. 15.Double 95 =
  16. 16.Half of 176 =
  17. 17.Half of 182 =
  18. 18.Half of 192 =
  19. 19.Half of 184 =
  20. 20.Double 21 =
  21. 21.Double 78 =
  22. 22.Double 19 =
  23. 23.Double 42 =
  24. 24.Double 66 =
  25. 25.Double 88 =
  26. 26.Half of 190 =
  27. 27.Half of 122 =
  28. 28.Double 61 =
  29. 29.Half of 126 =
  30. 30.Half of 166 =
  31. 31.Half of 188 =
  32. 32.Double 89 =
  33. 33.Half of 112 =
  34. 34.Double 82 =
  35. 35.Double 67 =
  36. 36.Double 24 =
  37. 37.Half of 160 =
  38. 38.Double 35 =
  39. 39.Double 32 =
  40. 40.Half of 38 =

Answer key

  1. 21
  2. 43
  3. 114
  4. 68
  5. 38
  6. 154
  7. 126
  8. 39
  9. 47
  10. 23
  11. 192
  12. 72
  13. 89
  14. 130
  15. 190
  16. 88
  17. 91
  18. 96
  19. 92
  20. 42
  21. 156
  22. 38
  23. 84
  24. 132
  25. 176
  26. 95
  27. 61
  28. 122
  29. 63
  30. 83
  31. 94
  32. 178
  33. 56
  34. 164
  35. 134
  36. 48
  37. 80
  38. 70
  39. 64
  40. 19

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