← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 20 · 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 54 =
  2. 2.Half of 68 =
  3. 3.Half of 158 =
  4. 4.Double 37 =
  5. 5.Half of 54 =
  6. 6.Half of 94 =
  7. 7.Half of 26 =
  8. 8.Double 57 =
  9. 9.Half of 110 =
  10. 10.Half of 192 =
  11. 11.Double 66 =
  12. 12.Double 73 =
  13. 13.Half of 182 =
  14. 14.Double 92 =
  15. 15.Double 22 =
  16. 16.Half of 136 =
  17. 17.Half of 28 =
  18. 18.Double 72 =
  19. 19.Half of 32 =
  20. 20.Double 48 =
  21. 21.Double 83 =
  22. 22.Half of 118 =
  23. 23.Half of 48 =
  24. 24.Half of 72 =
  25. 25.Double 21 =
  26. 26.Half of 86 =
  27. 27.Double 51 =
  28. 28.Half of 176 =
  29. 29.Double 19 =
  30. 30.Double 39 =
  31. 31.Half of 98 =
  32. 32.Half of 154 =
  33. 33.Half of 52 =
  34. 34.Half of 194 =
  35. 35.Half of 36 =
  36. 36.Half of 198 =
  37. 37.Half of 162 =
  38. 38.Double 76 =
  39. 39.Double 24 =
  40. 40.Half of 172 =

Answer key

  1. 108
  2. 34
  3. 79
  4. 74
  5. 27
  6. 47
  7. 13
  8. 114
  9. 55
  10. 96
  11. 132
  12. 146
  13. 91
  14. 184
  15. 44
  16. 68
  17. 14
  18. 144
  19. 16
  20. 96
  21. 166
  22. 59
  23. 24
  24. 36
  25. 42
  26. 43
  27. 102
  28. 88
  29. 38
  30. 78
  31. 49
  32. 77
  33. 26
  34. 97
  35. 18
  36. 99
  37. 81
  38. 152
  39. 48
  40. 86

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