← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 19 · 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 68 =
  2. 2.Double 92 =
  3. 3.Double 27 =
  4. 4.Double 62 =
  5. 5.Double 77 =
  6. 6.Double 21 =
  7. 7.Double 41 =
  8. 8.Half of 128 =
  9. 9.Half of 32 =
  10. 10.Half of 184 =
  11. 11.Double 61 =
  12. 12.Half of 108 =
  13. 13.Double 86 =
  14. 14.Double 64 =
  15. 15.Double 16 =
  16. 16.Half of 40 =
  17. 17.Double 93 =
  18. 18.Double 79 =
  19. 19.Half of 134 =
  20. 20.Double 78 =
  21. 21.Half of 190 =
  22. 22.Half of 174 =
  23. 23.Half of 176 =
  24. 24.Double 31 =
  25. 25.Double 58 =
  26. 26.Double 65 =
  27. 27.Half of 192 =
  28. 28.Half of 92 =
  29. 29.Double 26 =
  30. 30.Double 48 =
  31. 31.Half of 124 =
  32. 32.Double 81 =
  33. 33.Half of 44 =
  34. 34.Half of 60 =
  35. 35.Half of 26 =
  36. 36.Half of 72 =
  37. 37.Double 28 =
  38. 38.Half of 28 =
  39. 39.Double 56 =
  40. 40.Double 91 =

Answer key

  1. 34
  2. 184
  3. 54
  4. 124
  5. 154
  6. 42
  7. 82
  8. 64
  9. 16
  10. 92
  11. 122
  12. 54
  13. 172
  14. 128
  15. 32
  16. 20
  17. 186
  18. 158
  19. 67
  20. 156
  21. 95
  22. 87
  23. 88
  24. 62
  25. 116
  26. 130
  27. 96
  28. 46
  29. 52
  30. 96
  31. 62
  32. 162
  33. 22
  34. 30
  35. 13
  36. 36
  37. 56
  38. 14
  39. 112
  40. 182

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